{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-50214", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.429Z", "datePublished": "2025-06-18T11:03:51.561Z", "dateUpdated": "2026-05-11T19:15:00.409Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:15:00.409Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: Clear the connection field properly\n\ncoresight devices track their connections (output connections) and\nhold a reference to the fwnode. When a device goes away, we walk through\nthe devices on the coresight bus and make sure that the references\nare dropped. This happens both ways:\n a) For all output connections from the device, drop the reference to\n the target device via coresight_release_platform_data()\n\nb) Iterate over all the devices on the coresight bus and drop the\n reference to fwnode if *this* device is the target of the output\n connection, via coresight_remove_conns()->coresight_remove_match().\n\nHowever, the coresight_remove_match() doesn't clear the fwnode field,\nafter dropping the reference, this causes use-after-free and\nadditional refcount drops on the fwnode.\n\ne.g., if we have two devices, A and B, with a connection, A -> B.\nIf we remove B first, B would clear the reference on B, from A\nvia coresight_remove_match(). But when A is removed, it still has\na connection with fwnode still pointing to B. Thus it tries to drops\nthe reference in coresight_release_platform_data(), raising the bells\nlike :\n\n[ 91.990153] ------------[ cut here ]------------\n[ 91.990163] refcount_t: addition on 0; use-after-free.\n[ 91.990212] WARNING: CPU: 0 PID: 461 at lib/refcount.c:25 refcount_warn_saturate+0xa0/0x144\n[ 91.990260] Modules linked in: coresight_funnel coresight_replicator coresight_etm4x(-)\n crct10dif_ce coresight ip_tables x_tables ipv6 [last unloaded: coresight_cpu_debug]\n[ 91.990398] CPU: 0 PID: 461 Comm: rmmod Tainted: G W T 5.19.0-rc2+ #53\n[ 91.990418] Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb 1 2019\n[ 91.990434] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ 91.990454] pc : refcount_warn_saturate+0xa0/0x144\n[ 91.990476] lr : refcount_warn_saturate+0xa0/0x144\n[ 91.990496] sp : ffff80000c843640\n[ 91.990509] x29: ffff80000c843640 x28: ffff800009957c28 x27: ffff80000c8439a8\n[ 91.990560] x26: ffff00097eff1990 x25: ffff8000092b6ad8 x24: ffff00097eff19a8\n[ 91.990610] x23: ffff80000c8439a8 x22: 0000000000000000 x21: ffff80000c8439c2\n[ 91.990659] x20: 0000000000000000 x19: ffff00097eff1a10 x18: ffff80000ab99c40\n[ 91.990708] x17: 0000000000000000 x16: 0000000000000000 x15: ffff80000abf6fa0\n[ 91.990756] x14: 000000000000001d x13: 0a2e656572662d72 x12: 657466612d657375\n[ 91.990805] x11: 203b30206e6f206e x10: 6f69746964646120 x9 : ffff8000081aba28\n[ 91.990854] x8 : 206e6f206e6f6974 x7 : 69646461203a745f x6 : 746e756f63666572\n[ 91.990903] x5 : ffff00097648ec58 x4 : 0000000000000000 x3 : 0000000000000027\n[ 91.990952] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00080260ba00\n[ 91.991000] Call trace:\n[ 91.991012] refcount_warn_saturate+0xa0/0x144\n[ 91.991034] kobject_get+0xac/0xb0\n[ 91.991055] of_node_get+0x2c/0x40\n[ 91.991076] of_fwnode_get+0x40/0x60\n[ 91.991094] fwnode_handle_get+0x3c/0x60\n[ 91.991116] fwnode_get_nth_parent+0xf4/0x110\n[ 91.991137] fwnode_full_name_string+0x48/0xc0\n[ 91.991158] device_node_string+0x41c/0x530\n[ 91.991178] pointer+0x320/0x3ec\n[ 91.991198] vsnprintf+0x23c/0x750\n[ 91.991217] vprintk_store+0x104/0x4b0\n[ 91.991238] vprintk_emit+0x8c/0x360\n[ 91.991257] vprintk_default+0x44/0x50\n[ 91.991276] vprintk+0xcc/0xf0\n[ 91.991295] _printk+0x68/0x90\n[ 91.991315] of_node_release+0x13c/0x14c\n[ 91.991334] kobject_put+0x98/0x114\n[ 91.991354] of_node_put+0x24/0x34\n[ 91.991372] of_fwnode_put+0x40/0x5c\n[ 91.991390] fwnode_handle_put+0x38/0x50\n[ 91.991411] coresight_release_platform_data+0x74/0xb0 [coresight]\n[ 91.991472] coresight_unregister+0x64/0xcc [coresight]\n[ 91.991525] etm4_remove_dev+0x64/0x78 [coresight_etm4x]\n[ 91.991563] etm4_remove_amba+0x1c/0x2c [coresight_etm4x]\n[ 91.991598] amba_remove+0x3c/0x19c\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hwtracing/coresight/coresight-core.c"], "versions": [{"version": "37ea1ffddffa63c920ce826786fe610c78f57842", "lessThan": "e9205d8dd1cafb7cff689ef9ddf06276a68f54a4", "status": "affected", "versionType": "git"}, {"version": "37ea1ffddffa63c920ce826786fe610c78f57842", "lessThan": "847b9273dd61567fb77617eabc5fa002594db062", "status": "affected", "versionType": "git"}, {"version": "37ea1ffddffa63c920ce826786fe610c78f57842", "lessThan": "b49b29ee113a87997bcca0bb0585bb46582846c1", "status": "affected", "versionType": "git"}, {"version": "37ea1ffddffa63c920ce826786fe610c78f57842", "lessThan": "d43e967963c4d1b2b49f894d2f1b12865f87b098", "status": "affected", "versionType": "git"}, {"version": "37ea1ffddffa63c920ce826786fe610c78f57842", "lessThan": "bc57850fcb7e4cb91b6321d0ce83357cefd55c54", "status": "affected", "versionType": "git"}, {"version": "37ea1ffddffa63c920ce826786fe610c78f57842", "lessThan": "2af89ebacf299b7fba5f3087d35e8a286ec33706", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hwtracing/coresight/coresight-core.c"], "versions": [{"version": "5.3", "status": "affected"}, {"version": "0", "lessThan": "5.3", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.211", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.137", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.61", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.18.18", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.2", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.4.211"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.10.137"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.15.61"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.18.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.19.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e9205d8dd1cafb7cff689ef9ddf06276a68f54a4"}, {"url": "https://git.kernel.org/stable/c/847b9273dd61567fb77617eabc5fa002594db062"}, {"url": "https://git.kernel.org/stable/c/b49b29ee113a87997bcca0bb0585bb46582846c1"}, {"url": "https://git.kernel.org/stable/c/d43e967963c4d1b2b49f894d2f1b12865f87b098"}, {"url": "https://git.kernel.org/stable/c/bc57850fcb7e4cb91b6321d0ce83357cefd55c54"}, {"url": "https://git.kernel.org/stable/c/2af89ebacf299b7fba5f3087d35e8a286ec33706"}], "title": "coresight: Clear the connection field properly", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "DABFD37F-7E0C-41E0-9811-29A4EF9C11FB", "versionEndExcluding": "5.4.211", "versionStartIncluding": "5.3", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C2BF720F-C5EE-4DE2-9BDF-CE4CFBC767F4", "versionEndExcluding": "5.10.137", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "51861563-7F40-460F-82CD-2D3FBDAD6618", "versionEndExcluding": "5.15.61", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5B42E453-8837-49D0-A5EF-03F818A6DC11", "versionEndExcluding": "5.18.18", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A1A2A5A5-4598-4D7E-BA07-4660398D6C8F", "versionEndExcluding": "5.19.2", "versionStartIncluding": "5.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncoresight: Clear the connection field properly\n\ncoresight devices track their connections (output connections) and\nhold a reference to the fwnode. When a device goes away, we walk through\nthe devices on the coresight bus and make sure that the references\nare dropped. This happens both ways:\n a) For all output connections from the device, drop the reference to\n the target device via coresight_release_platform_data()\n\nb) Iterate over all the devices on the coresight bus and drop the\n reference to fwnode if *this* device is the target of the output\n connection, via coresight_remove_conns()->coresight_remove_match().\n\nHowever, the coresight_remove_match() doesn't clear the fwnode field,\nafter dropping the reference, this causes use-after-free and\nadditional refcount drops on the fwnode.\n\ne.g., if we have two devices, A and B, with a connection, A -> B.\nIf we remove B first, B would clear the reference on B, from A\nvia coresight_remove_match(). But when A is removed, it still has\na connection with fwnode still pointing to B. Thus it tries to drops\nthe reference in coresight_release_platform_data(), raising the bells\nlike :\n\n[ 91.990153] ------------[ cut here ]------------\n[ 91.990163] refcount_t: addition on 0; use-after-free.\n[ 91.990212] WARNING: CPU: 0 PID: 461 at lib/refcount.c:25 refcount_warn_saturate+0xa0/0x144\n[ 91.990260] Modules linked in: coresight_funnel coresight_replicator coresight_etm4x(-)\n crct10dif_ce coresight ip_tables x_tables ipv6 [last unloaded: coresight_cpu_debug]\n[ 91.990398] CPU: 0 PID: 461 Comm: rmmod Tainted: G W T 5.19.0-rc2+ #53\n[ 91.990418] Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb 1 2019\n[ 91.990434] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ 91.990454] pc : refcount_warn_saturate+0xa0/0x144\n[ 91.990476] lr : refcount_warn_saturate+0xa0/0x144\n[ 91.990496] sp : ffff80000c843640\n[ 91.990509] x29: ffff80000c843640 x28: ffff800009957c28 x27: ffff80000c8439a8\n[ 91.990560] x26: ffff00097eff1990 x25: ffff8000092b6ad8 x24: ffff00097eff19a8\n[ 91.990610] x23: ffff80000c8439a8 x22: 0000000000000000 x21: ffff80000c8439c2\n[ 91.990659] x20: 0000000000000000 x19: ffff00097eff1a10 x18: ffff80000ab99c40\n[ 91.990708] x17: 0000000000000000 x16: 0000000000000000 x15: ffff80000abf6fa0\n[ 91.990756] x14: 000000000000001d x13: 0a2e656572662d72 x12: 657466612d657375\n[ 91.990805] x11: 203b30206e6f206e x10: 6f69746964646120 x9 : ffff8000081aba28\n[ 91.990854] x8 : 206e6f206e6f6974 x7 : 69646461203a745f x6 : 746e756f63666572\n[ 91.990903] x5 : ffff00097648ec58 x4 : 0000000000000000 x3 : 0000000000000027\n[ 91.990952] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00080260ba00\n[ 91.991000] Call trace:\n[ 91.991012] refcount_warn_saturate+0xa0/0x144\n[ 91.991034] kobject_get+0xac/0xb0\n[ 91.991055] of_node_get+0x2c/0x40\n[ 91.991076] of_fwnode_get+0x40/0x60\n[ 91.991094] fwnode_handle_get+0x3c/0x60\n[ 91.991116] fwnode_get_nth_parent+0xf4/0x110\n[ 91.991137] fwnode_full_name_string+0x48/0xc0\n[ 91.991158] device_node_string+0x41c/0x530\n[ 91.991178] pointer+0x320/0x3ec\n[ 91.991198] vsnprintf+0x23c/0x750\n[ 91.991217] vprintk_store+0x104/0x4b0\n[ 91.991238] vprintk_emit+0x8c/0x360\n[ 91.991257] vprintk_default+0x44/0x50\n[ 91.991276] vprintk+0xcc/0xf0\n[ 91.991295] _printk+0x68/0x90\n[ 91.991315] of_node_release+0x13c/0x14c\n[ 91.991334] kobject_put+0x98/0x114\n[ 91.991354] of_node_put+0x24/0x34\n[ 91.991372] of_fwnode_put+0x40/0x5c\n[ 91.991390] fwnode_handle_put+0x38/0x50\n[ 91.991411] coresight_release_platform_data+0x74/0xb0 [coresight]\n[ 91.991472] coresight_unregister+0x64/0xcc [coresight]\n[ 91.991525] etm4_remove_dev+0x64/0x78 [coresight_etm4x]\n[ 91.991563] etm4_remove_amba+0x1c/0x2c [coresight_etm4x]\n[ 91.991598] amba_remove+0x3c/0x19c\n---truncated---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: coresight: Borrar el campo de conexi\u00f3n correctamente los dispositivos coresight rastrean sus conexiones (conexiones de salida) y mantienen una referencia al fwnode. Cuando un dispositivo desaparece, recorremos los dispositivos en el bus coresight y nos aseguramos de que se eliminen las referencias. Esto sucede en ambos sentidos: a) Para todas las conexiones de salida desde el dispositivo, eliminamos la referencia al dispositivo de destino mediante coresight_release_platform_data() b) Iteramos sobre todos los dispositivos en el bus coresight y eliminamos la referencia a fwnode si *este* dispositivo es el destino de la conexi\u00f3n de salida, mediante coresight_remove_conns()->coresight_remove_match(). Sin embargo, coresight_remove_match() no borra el campo fwnode, despu\u00e9s de eliminar la referencia, esto causa Use-After-Free y disminuciones adicionales de refcount en el fwnode. Por ejemplo, si tenemos dos dispositivos, A y B, conectados, A -> B. Si eliminamos B primero, B eliminar\u00eda la referencia en B desde A mediante coresight_remove_match(). Sin embargo, al eliminar A, a\u00fan mantiene una conexi\u00f3n con fwnode apuntando a B. Por lo tanto, intenta eliminar la referencia en coresight_release_platform_data(), lo que genera alertas como: [ 91.990153 ------------[ cortar aqu\u00ed ]------------ [ 91.990163 ] refcount_t: adici\u00f3n en 0; Use-After-Free. [ 91.990212] ADVERTENCIA: CPU: 0 PID: 461 en lib/refcount.c:25 refcount_warn_saturate+0xa0/0x144 [ 91.990260] M\u00f3dulos vinculados: coresight_funnel coresight_replicator coresight_etm4x(-) crct10dif_ce coresight ip_tables x_tables ipv6 [\u00faltima descarga: coresight_cpu_debug] [ 91.990398] CPU: 0 PID: 461 Comm: rmmod Contaminado: GWT 5.19.0-rc2+ #53 [ 91.990418] Nombre del hardware: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II 1 de febrero de 2019 [ 91.990434] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 91.990454] pc : refcount_warn_saturate+0xa0/0x144 [ 91.990476] lr : refcount_warn_saturate+0xa0/0x144 [ 91.990496] sp : ffff80000c843640 [ 91.990509] x29: ffff80000c843640 x28: ffff800009957c28 x27: ffff80000c8439a8 [ 91.990560] x26: ffff00097eff1990 x25: ffff8000092b6ad8 x24: ffff00097eff19a8 [91.990610] x23: ffff80000c8439a8 x22: 0000000000000000 x21: ffff80000c8439c2 [91.990659] x20: 0000000000000000 x19: ffff00097eff1a10 x18: ffff80000ab99c40 [91.990708] x17: 000000000000000 x16: 0000000000000000 x15: ffff80000abf6fa0 [ 91.990756] x14: 000000000000001d x13: 0a2e656572662d72 x12: 657466612d657375 [ 91.990805] x11: 203b30206e6f206e x10: 6f69746964646120 x9: ffff8000081aba28 [91.990854] x8: 206e6f206e6f6974 x7: 69646461203a745f x6: 746e756f63666572 [91.990903] x5: ffff00097648ec58 x4: 0000000000000000 x3: 0000000000000027 [91.990952] x2: 0000000000000000 x1: 0000000000000000 x0: ffff00080260ba00 [91.991000] Rastreo de llamadas: [ 91.991012] refcount_warn_saturate+0xa0/0x144 [ 91.991034] kobject_get+0xac/0xb0 [ 91.991055] of_node_get+0x2c/0x40 [ 91.991076] of_fwnode_get+0x40/0x60 [ 91.991094] fwnode_handle_get+0x3c/0x60 [ 91.991116] fwnode_get_nth_parent+0xf4/0x110 [ 91.991137] fwnode_full_name_string+0x48/0xc0 [ 91.991158] device_node_string+0x41c/0x530 [ 91.991178] pointer+0x320/0x3ec [ 91.991198] vsnprintf+0x23c/0x750 [ 91.991217] vprintk_store+0x104/0x4b0 [ 91.991238] vprintk_emit+0x8c/0x360 [ 91.991257] vprintk_default+0x44/0x50 [ 91.991276] vprintk+0xcc/0xf0 [ 91.991295] _printk+0x68/0x90 [ 91.991315] of_node_release+0x13c/0x14c [ 91.991334] kobject_put+0x98/0x114 [ 91.991354] of_node_put+0x24/0x34 [ 91.991372] of_fwnode_put+0x40/0x5c [ 91.991390] fwnode_handle_put+0x38/0x50 [ 91.991411] coresight_release_platform_data+0x74/0xb0 [coresight] [ 91.991472] coresight_unregister+0x64/0xcc [coresight] [ 91.991525] etm4_remove_dev+0x64/0x78 [coresight_etm4x] [ 91.991563] etm4_remove_amba+0x1c/0x2c [coresight_etm4x] [ 91.991598] amba_remove+0x3c/0x19c ---truncado---"}], "id": "CVE-2022-50214", "lastModified": "2025-11-19T13:00:06.100", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-06-18T11:15:52.310", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2af89ebacf299b7fba5f3087d35e8a286ec33706"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/847b9273dd61567fb77617eabc5fa002594db062"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b49b29ee113a87997bcca0bb0585bb46582846c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bc57850fcb7e4cb91b6321d0ce83357cefd55c54"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d43e967963c4d1b2b49f894d2f1b12865f87b098"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e9205d8dd1cafb7cff689ef9ddf06276a68f54a4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: coresight: Clear the connection field properly", "id": "2373513", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373513"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncoresight: Clear the connection field properly\ncoresight devices track their connections (output connections) and\nhold a reference to the fwnode. When a device goes away, we walk through\nthe devices on the coresight bus and make sure that the references\nare dropped. This happens both ways:\na) For all output connections from the device, drop the reference to\nthe target device via coresight_release_platform_data()\nb) Iterate over all the devices on the coresight bus and drop the\nreference to fwnode if *this* device is the target of the output\nconnection, via coresight_remove_conns()->coresight_remove_match().\nHowever, the coresight_remove_match() doesn't clear the fwnode field,\nafter dropping the reference, this causes use-after-free and\nadditional refcount drops on the fwnode.\ne.g., if we have two devices, A and B, with a connection, A -> B.\nIf we remove B first, B would clear the reference on B, from A\nvia coresight_remove_match(). But when A is removed, it still has\na connection with fwnode still pointing to B. Thus it tries to drops\nthe reference in coresight_release_platform_data(), raising the bells\nlike :\n[ 91.990153] ------------[ cut here ]------------\n[ 91.990163] refcount_t: addition on 0; use-after-free.\n[ 91.990212] WARNING: CPU: 0 PID: 461 at lib/refcount.c:25 refcount_warn_saturate+0xa0/0x144\n[ 91.990260] Modules linked in: coresight_funnel coresight_replicator coresight_etm4x(-)\ncrct10dif_ce coresight ip_tables x_tables ipv6 [last unloaded: coresight_cpu_debug]\n[ 91.990398] CPU: 0 PID: 461 Comm: rmmod Tainted: G W T 5.19.0-rc2+ #53\n[ 91.990418] Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform, BIOS EDK II Feb 1 2019\n[ 91.990434] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[ 91.990454] pc : refcount_warn_saturate+0xa0/0x144\n[ 91.990476] lr : refcount_warn_saturate+0xa0/0x144\n[ 91.990496] sp : ffff80000c843640\n[ 91.990509] x29: ffff80000c843640 x28: ffff800009957c28 x27: ffff80000c8439a8\n[ 91.990560] x26: ffff00097eff1990 x25: ffff8000092b6ad8 x24: ffff00097eff19a8\n[ 91.990610] x23: ffff80000c8439a8 x22: 0000000000000000 x21: ffff80000c8439c2\n[ 91.990659] x20: 0000000000000000 x19: ffff00097eff1a10 x18: ffff80000ab99c40\n[ 91.990708] x17: 0000000000000000 x16: 0000000000000000 x15: ffff80000abf6fa0\n[ 91.990756] x14: 000000000000001d x13: 0a2e656572662d72 x12: 657466612d657375\n[ 91.990805] x11: 203b30206e6f206e x10: 6f69746964646120 x9 : ffff8000081aba28\n[ 91.990854] x8 : 206e6f206e6f6974 x7 : 69646461203a745f x6 : 746e756f63666572\n[ 91.990903] x5 : ffff00097648ec58 x4 : 0000000000000000 x3 : 0000000000000027\n[ 91.990952] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00080260ba00\n[ 91.991000] Call trace:\n[ 91.991012] refcount_warn_saturate+0xa0/0x144\n[ 91.991034] kobject_get+0xac/0xb0\n[ 91.991055] of_node_get+0x2c/0x40\n[ 91.991076] of_fwnode_get+0x40/0x60\n[ 91.991094] fwnode_handle_get+0x3c/0x60\n[ 91.991116] fwnode_get_nth_parent+0xf4/0x110\n[ 91.991137] fwnode_full_name_string+0x48/0xc0\n[ 91.991158] device_node_string+0x41c/0x530\n[ 91.991178] pointer+0x320/0x3ec\n[ 91.991198] vsnprintf+0x23c/0x750\n[ 91.991217] vprintk_store+0x104/0x4b0\n[ 91.991238] vprintk_emit+0x8c/0x360\n[ 91.991257] vprintk_default+0x44/0x50\n[ 91.991276] vprintk+0xcc/0xf0\n[ 91.991295] _printk+0x68/0x90\n[ 91.991315] of_node_release+0x13c/0x14c\n[ 91.991334] kobject_put+0x98/0x114\n[ 91.991354] of_node_put+0x24/0x34\n[ 91.991372] of_fwnode_put+0x40/0x5c\n[ 91.991390] fwnode_handle_put+0x38/0x50\n[ 91.991411] coresight_release_platform_data+0x74/0xb0 [coresight]\n[ 91.991472] coresight_unregister+0x64/0xcc [coresight]\n[ 91.991525] etm4_remove_dev+0x64/0x78 [coresight_etm4x]\n[ 91.991563] etm4_remove_amba+0x1c/0x2c [coresight_etm4x]\n[ 91.991598] amba_remove+0x3c/0x19c\n---truncated---"], "name": "CVE-2022-50214", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-50214\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-50214\nhttps://lore.kernel.org/linux-cve-announce/2025061844-CVE-2022-50214-6569@gregkh/T"], "threat_severity": "Moderate"}

{}