{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-56672", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-27T15:00:39.845Z", "datePublished": "2024-12-27T15:06:33.358Z", "dateUpdated": "2026-05-12T12:01:24.932Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:57:01.673Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: Fix UAF in blkcg_unpin_online()\n\nblkcg_unpin_online() walks up the blkcg hierarchy putting the online pin. To\nwalk up, it uses blkcg_parent(blkcg) but it was calling that after\nblkcg_destroy_blkgs(blkcg) which could free the blkcg, leading to the\nfollowing UAF:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in blkcg_unpin_online+0x15a/0x270\n Read of size 8 at addr ffff8881057678c0 by task kworker/9:1/117\n\n CPU: 9 UID: 0 PID: 117 Comm: kworker/9:1 Not tainted 6.13.0-rc1-work-00182-gb8f52214c61a-dirty #48\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 02/02/2022\n Workqueue: cgwb_release cgwb_release_workfn\n Call Trace:\n <TASK>\n dump_stack_lvl+0x27/0x80\n print_report+0x151/0x710\n kasan_report+0xc0/0x100\n blkcg_unpin_online+0x15a/0x270\n cgwb_release_workfn+0x194/0x480\n process_scheduled_works+0x71b/0xe20\n worker_thread+0x82a/0xbd0\n kthread+0x242/0x2c0\n ret_from_fork+0x33/0x70\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n ...\n Freed by task 1944:\n kasan_save_track+0x2b/0x70\n kasan_save_free_info+0x3c/0x50\n __kasan_slab_free+0x33/0x50\n kfree+0x10c/0x330\n css_free_rwork_fn+0xe6/0xb30\n process_scheduled_works+0x71b/0xe20\n worker_thread+0x82a/0xbd0\n kthread+0x242/0x2c0\n ret_from_fork+0x33/0x70\n ret_from_fork_asm+0x1a/0x30\n\nNote that the UAF is not easy to trigger as the free path is indirected\nbehind a couple RCU grace periods and a work item execution. I could only\ntrigger it with artifical msleep() injected in blkcg_unpin_online().\n\nFix it by reading the parent pointer before destroying the blkcg's blkg's."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["block/blk-cgroup.c"], "versions": [{"version": "4308a434e5e08c78676aa66bc626ef78cbef0883", "lessThan": "83f5a87ee8caa76a917f59912a74d6811f773c67", "status": "affected", "versionType": "git"}, {"version": "4308a434e5e08c78676aa66bc626ef78cbef0883", "lessThan": "8a07350fe070017a887433f4d6909433955be5f1", "status": "affected", "versionType": "git"}, {"version": "4308a434e5e08c78676aa66bc626ef78cbef0883", "lessThan": "64afc6fe24c9896c0153e5a199bcea241ecb0d5c", "status": "affected", "versionType": "git"}, {"version": "4308a434e5e08c78676aa66bc626ef78cbef0883", "lessThan": "5baa28569c924d9a90d036c2aaab79f791fedaf8", "status": "affected", "versionType": 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"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:52:20.150Z"}}, {"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T12:01:24.932Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}]}]}}

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To\nwalk up, it uses blkcg_parent(blkcg) but it was calling that after\nblkcg_destroy_blkgs(blkcg) which could free the blkcg, leading to the\nfollowing UAF:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in blkcg_unpin_online+0x15a/0x270\n Read of size 8 at addr ffff8881057678c0 by task kworker/9:1/117\n\n CPU: 9 UID: 0 PID: 117 Comm: kworker/9:1 Not tainted 6.13.0-rc1-work-00182-gb8f52214c61a-dirty #48\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 02/02/2022\n Workqueue: cgwb_release cgwb_release_workfn\n Call Trace:\n <TASK>\n dump_stack_lvl+0x27/0x80\n print_report+0x151/0x710\n kasan_report+0xc0/0x100\n blkcg_unpin_online+0x15a/0x270\n cgwb_release_workfn+0x194/0x480\n process_scheduled_works+0x71b/0xe20\n worker_thread+0x82a/0xbd0\n kthread+0x242/0x2c0\n ret_from_fork+0x33/0x70\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n ...\n Freed by task 1944:\n kasan_save_track+0x2b/0x70\n kasan_save_free_info+0x3c/0x50\n __kasan_slab_free+0x33/0x50\n kfree+0x10c/0x330\n css_free_rwork_fn+0xe6/0xb30\n process_scheduled_works+0x71b/0xe20\n worker_thread+0x82a/0xbd0\n kthread+0x242/0x2c0\n ret_from_fork+0x33/0x70\n ret_from_fork_asm+0x1a/0x30\n\nNote that the UAF is not easy to trigger as the free path is indirected\nbehind a couple RCU grace periods and a work item execution. I could only\ntrigger it with artifical msleep() injected in blkcg_unpin_online().\n\nFix it by reading the parent pointer before destroying the blkcg's blkg's."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.234", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.177", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.121", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.67", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.6", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.13", "versionStartIncluding": "5.7"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:57:01.673Z"}}}, "cveMetadata": {"cveId": "CVE-2024-56672", "state": "PUBLISHED", "dateUpdated": "2026-05-12T12:01:24.932Z", "dateReserved": "2024-12-27T15:00:39.845Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-12-27T15:06:33.358Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "DA13D8C8-4561-4F7A-8047-DAD1CB2DABD7", "versionEndExcluding": "6.1.121", "versionStartIncluding": "5.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BF4F2CD1-2CA6-4D6B-9B0C-57C3C4D6544A", "versionEndExcluding": "6.6.67", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0CB1A9BB-F95E-43DD-A2FD-147912FD91E5", "versionEndExcluding": "6.12.6", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: Fix UAF in blkcg_unpin_online()\n\nblkcg_unpin_online() walks up the blkcg hierarchy putting the online pin. To\nwalk up, it uses blkcg_parent(blkcg) but it was calling that after\nblkcg_destroy_blkgs(blkcg) which could free the blkcg, leading to the\nfollowing UAF:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in blkcg_unpin_online+0x15a/0x270\n Read of size 8 at addr ffff8881057678c0 by task kworker/9:1/117\n\n CPU: 9 UID: 0 PID: 117 Comm: kworker/9:1 Not tainted 6.13.0-rc1-work-00182-gb8f52214c61a-dirty #48\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 02/02/2022\n Workqueue: cgwb_release cgwb_release_workfn\n Call Trace:\n <TASK>\n dump_stack_lvl+0x27/0x80\n print_report+0x151/0x710\n kasan_report+0xc0/0x100\n blkcg_unpin_online+0x15a/0x270\n cgwb_release_workfn+0x194/0x480\n process_scheduled_works+0x71b/0xe20\n worker_thread+0x82a/0xbd0\n kthread+0x242/0x2c0\n ret_from_fork+0x33/0x70\n ret_from_fork_asm+0x1a/0x30\n </TASK>\n ...\n Freed by task 1944:\n kasan_save_track+0x2b/0x70\n kasan_save_free_info+0x3c/0x50\n __kasan_slab_free+0x33/0x50\n kfree+0x10c/0x330\n css_free_rwork_fn+0xe6/0xb30\n process_scheduled_works+0x71b/0xe20\n worker_thread+0x82a/0xbd0\n kthread+0x242/0x2c0\n ret_from_fork+0x33/0x70\n ret_from_fork_asm+0x1a/0x30\n\nNote that the UAF is not easy to trigger as the free path is indirected\nbehind a couple RCU grace periods and a work item execution. I could only\ntrigger it with artifical msleep() injected in blkcg_unpin_online().\n\nFix it by reading the parent pointer before destroying the blkcg's blkg's."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: blk-cgroup: corrige UAF en blkcg_unpin_online() blkcg_unpin_online() sube por la jerarqu\u00eda blkcg y coloca el pin en l\u00ednea. Para subir, usa blkcg_parent(blkcg) pero lo estaba llamando despu\u00e9s de blkcg_destroy_blkgs(blkcg) que podr\u00eda liberar el blkcg, lo que lleva al siguiente UAF: ====================================================================== ERROR: KASAN: slab-use-after-free en blkcg_unpin_online+0x15a/0x270 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff8881057678c0 por la tarea kworker/9:1/117 CPU: 9 UID: 0 PID: 117 Comm: kworker/9:1 No contaminado 6.13.0-rc1-work-00182-gb8f52214c61a-dirty #48 Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS desconocido 02/02/2022 Cola de trabajo: cgwb_release cgwb_release_workfn Seguimiento de llamadas: dump_stack_lvl+0x27/0x80 print_report+0x151/0x710 kasan_report+0xc0/0x100 blkcg_unpin_online+0x15a/0x270 cgwb_release_workfn+0x194/0x480 process_scheduled_works+0x71b/0xe20 worker_thread+0x82a/0xbd0 kthread+0x242/0x2c0 ret_from_fork+0x33/0x70 ret_from_fork_asm+0x1a/0x30 ... Liberado por la tarea 1944: kasan_save_track+0x2b/0x70 kasan_save_free_info+0x3c/0x50 __kasan_slab_free+0x33/0x50 kfree+0x10c/0x330 css_free_rwork_fn+0xe6/0xb30 process_scheduled_works+0x71b/0xe20 worker_thread+0x82a/0xbd0 kthread+0x242/0x2c0 ret_from_fork+0x33/0x70 ret_from_fork_asm+0x1a/0x30 Tenga en cuenta que el UAF no es f\u00e1cil de activar ya que la ruta libre es Se produjo un error indirecto detr\u00e1s de un par de per\u00edodos de gracia de RCU y una ejecuci\u00f3n de elemento de trabajo. Solo pude activarlo con msleep() artificial inyectado en blkcg_unpin_online(). Solucione el problema leyendo el puntero principal antes de destruir los blkg de blkcg."}], "id": "CVE-2024-56672", "lastModified": "2026-05-12T13:16:22.777", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-12-27T15:15:27.107", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/29d1e06560f0f6179062ac638b4064deb637d1ad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5baa28569c924d9a90d036c2aaab79f791fedaf8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64afc6fe24c9896c0153e5a199bcea241ecb0d5c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/83f5a87ee8caa76a917f59912a74d6811f773c67"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/86e6ca55b83c575ab0f2e105cf08f98e58d3d7af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8a07350fe070017a887433f4d6909433955be5f1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: blk-cgroup: Fix UAF in blkcg_unpin_online()", "id": "2334537", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2334537"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nblk-cgroup: Fix UAF in blkcg_unpin_online()\nblkcg_unpin_online() walks up the blkcg hierarchy putting the online pin. To\nwalk up, it uses blkcg_parent(blkcg) but it was calling that after\nblkcg_destroy_blkgs(blkcg) which could free the blkcg, leading to the\nfollowing UAF:\n==================================================================\nBUG: KASAN: slab-use-after-free in blkcg_unpin_online+0x15a/0x270\nRead of size 8 at addr ffff8881057678c0 by task kworker/9:1/117\nCPU: 9 UID: 0 PID: 117 Comm: kworker/9:1 Not tainted 6.13.0-rc1-work-00182-gb8f52214c61a-dirty #48\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS unknown 02/02/2022\nWorkqueue: cgwb_release cgwb_release_workfn\nCall Trace:\n<TASK>\ndump_stack_lvl+0x27/0x80\nprint_report+0x151/0x710\nkasan_report+0xc0/0x100\nblkcg_unpin_online+0x15a/0x270\ncgwb_release_workfn+0x194/0x480\nprocess_scheduled_works+0x71b/0xe20\nworker_thread+0x82a/0xbd0\nkthread+0x242/0x2c0\nret_from_fork+0x33/0x70\nret_from_fork_asm+0x1a/0x30\n</TASK>\n...\nFreed by task 1944:\nkasan_save_track+0x2b/0x70\nkasan_save_free_info+0x3c/0x50\n__kasan_slab_free+0x33/0x50\nkfree+0x10c/0x330\ncss_free_rwork_fn+0xe6/0xb30\nprocess_scheduled_works+0x71b/0xe20\nworker_thread+0x82a/0xbd0\nkthread+0x242/0x2c0\nret_from_fork+0x33/0x70\nret_from_fork_asm+0x1a/0x30\nNote that the UAF is not easy to trigger as the free path is indirected\nbehind a couple RCU grace periods and a work item execution. I could only\ntrigger it with artifical msleep() injected in blkcg_unpin_online().\nFix it by reading the parent pointer before destroying the blkcg's blkg's."], "name": "CVE-2024-56672", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "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": "2024-12-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-56672\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-56672\nhttps://lore.kernel.org/linux-cve-announce/2024122755-CVE-2024-56672-8d29@gregkh/T"], "statement": "This issue is considered to be a moderate impact flaw, as the exploitation for this will need an ADMIN (or ROOT) privilege (PR:H).", "threat_severity": "Moderate"}

{}