{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-38305", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.002Z", "datePublished": "2025-07-10T07:42:16.127Z", "dateUpdated": "2026-05-11T21:25:24.378Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:25:24.378Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nptp: remove ptp->n_vclocks check logic in ptp_vclock_in_use()\n\nThere is no disagreement that we should check both ptp->is_virtual_clock\nand ptp->n_vclocks to check if the ptp virtual clock is in use.\n\nHowever, when we acquire ptp->n_vclocks_mux to read ptp->n_vclocks in\nptp_vclock_in_use(), we observe a recursive lock in the call trace\nstarting from n_vclocks_store().\n\n============================================\nWARNING: possible recursive locking detected\n6.15.0-rc6 #1 Not tainted\n--------------------------------------------\nsyz.0.1540/13807 is trying to acquire lock:\nffff888035a24868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, at:\n ptp_vclock_in_use drivers/ptp/ptp_private.h:103 [inline]\nffff888035a24868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, at:\n ptp_clock_unregister+0x21/0x250 drivers/ptp/ptp_clock.c:415\n\nbut task is already holding lock:\nffff888030704868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, at:\n n_vclocks_store+0xf1/0x6d0 drivers/ptp/ptp_sysfs.c:215\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n CPU0\n ----\n lock(&ptp->n_vclocks_mux);\n lock(&ptp->n_vclocks_mux);\n\n *** DEADLOCK ***\n....\n============================================\n\nThe best way to solve this is to remove the logic that checks\nptp->n_vclocks in ptp_vclock_in_use().\n\nThe reason why this is appropriate is that any path that uses\nptp->n_vclocks must unconditionally check if ptp->n_vclocks is greater\nthan 0 before unregistering vclocks, and all functions are already\nwritten this way. And in the function that uses ptp->n_vclocks, we\nalready get ptp->n_vclocks_mux before unregistering vclocks.\n\nTherefore, we need to remove the redundant check for ptp->n_vclocks in\nptp_vclock_in_use() to prevent recursive locking."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/ptp/ptp_private.h"], "versions": [{"version": "73f37068d540eba5f93ba3a0019bf479d35ebd76", "lessThan": "5d217e7031a5c06d366580fc6ddbf43527b780d4", "status": "affected", "versionType": "git"}, {"version": "73f37068d540eba5f93ba3a0019bf479d35ebd76", "lessThan": "b1b73c452331451020be3bf4b014901015ae6663", "status": "affected", "versionType": "git"}, {"version": "73f37068d540eba5f93ba3a0019bf479d35ebd76", "lessThan": "259119595227fd20f6aa29d85abe086b6fdd9eb1", "status": "affected", "versionType": "git"}, {"version": "73f37068d540eba5f93ba3a0019bf479d35ebd76", "lessThan": "b93e6fef4eda48e17d9c642b9abad98a066fd4a3", "status": "affected", "versionType": "git"}, {"version": "73f37068d540eba5f93ba3a0019bf479d35ebd76", "lessThan": "ef8fc007c28a30a4c0d90bf755e0f343d99bb392", "status": "affected", "versionType": "git"}, {"version": "73f37068d540eba5f93ba3a0019bf479d35ebd76", "lessThan": "87f7ce260a3c838b49e1dc1ceedf1006795157a2", "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/ptp/ptp_private.h"], "versions": [{"version": "5.14", "status": "affected"}, {"version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.186", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.142", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.94", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.34", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.3", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16", "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": "5.14", "versionEndExcluding": "5.15.186"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.142"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.12.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.15.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5d217e7031a5c06d366580fc6ddbf43527b780d4"}, {"url": "https://git.kernel.org/stable/c/b1b73c452331451020be3bf4b014901015ae6663"}, {"url": "https://git.kernel.org/stable/c/259119595227fd20f6aa29d85abe086b6fdd9eb1"}, {"url": "https://git.kernel.org/stable/c/b93e6fef4eda48e17d9c642b9abad98a066fd4a3"}, {"url": "https://git.kernel.org/stable/c/ef8fc007c28a30a4c0d90bf755e0f343d99bb392"}, {"url": "https://git.kernel.org/stable/c/87f7ce260a3c838b49e1dc1ceedf1006795157a2"}], "title": "ptp: remove ptp->n_vclocks check logic in ptp_vclock_in_use()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:36:22.602Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7F369340-2B76-438A-A8D2-7A0F994DC4AC", "versionEndExcluding": "5.15.186", "versionStartIncluding": "5.14.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "459B4E94-FE0E-434D-B782-95E3A5FFC6B1", "versionEndExcluding": "6.1.142", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "304E3F01-7D7A-4908-994E-7F95C5C00B06", "versionEndExcluding": "6.6.94", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4FFA54AA-CDFE-4591-BD07-72813D0948F4", "versionEndExcluding": "6.12.34", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0541C761-BD5E-4C1A-8432-83B375D7EB92", "versionEndExcluding": "6.15.3", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:*", "matchCriteriaId": "6A05198E-F8FA-4517-8D0E-8C95066AED38", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*", "matchCriteriaId": "23B9E5C6-FAB5-4A02-9E39-27C8787B0991", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:*", "matchCriteriaId": "D185CF67-7E4A-4154-93DB-CE379C67DB56", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc4:*:*:*:*:*:*", "matchCriteriaId": "D1DA0AF6-02F4-47C7-A318-8C006ED0C665", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc5:*:*:*:*:*:*", "matchCriteriaId": "49DD30B1-8C99-4C38-A66B-CAB3827BEE8A", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc6:*:*:*:*:*:*", "matchCriteriaId": "15013998-4AF0-4CDC-AB13-829ECD8A8E66", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.14:rc7:*:*:*:*:*:*", "matchCriteriaId": "376A25CF-C05B-48F1-99B1-8FB0314A8E06", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:rc1:*:*:*:*:*:*", "matchCriteriaId": "6D4894DB-CCFE-4602-B1BF-3960B2E19A01", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nptp: remove ptp->n_vclocks check logic in ptp_vclock_in_use()\n\nThere is no disagreement that we should check both ptp->is_virtual_clock\nand ptp->n_vclocks to check if the ptp virtual clock is in use.\n\nHowever, when we acquire ptp->n_vclocks_mux to read ptp->n_vclocks in\nptp_vclock_in_use(), we observe a recursive lock in the call trace\nstarting from n_vclocks_store().\n\n============================================\nWARNING: possible recursive locking detected\n6.15.0-rc6 #1 Not tainted\n--------------------------------------------\nsyz.0.1540/13807 is trying to acquire lock:\nffff888035a24868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, at:\n ptp_vclock_in_use drivers/ptp/ptp_private.h:103 [inline]\nffff888035a24868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, at:\n ptp_clock_unregister+0x21/0x250 drivers/ptp/ptp_clock.c:415\n\nbut task is already holding lock:\nffff888030704868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, at:\n n_vclocks_store+0xf1/0x6d0 drivers/ptp/ptp_sysfs.c:215\n\nother info that might help us debug this:\n Possible unsafe locking scenario:\n\n CPU0\n ----\n lock(&ptp->n_vclocks_mux);\n lock(&ptp->n_vclocks_mux);\n\n *** DEADLOCK ***\n....\n============================================\n\nThe best way to solve this is to remove the logic that checks\nptp->n_vclocks in ptp_vclock_in_use().\n\nThe reason why this is appropriate is that any path that uses\nptp->n_vclocks must unconditionally check if ptp->n_vclocks is greater\nthan 0 before unregistering vclocks, and all functions are already\nwritten this way. And in the function that uses ptp->n_vclocks, we\nalready get ptp->n_vclocks_mux before unregistering vclocks.\n\nTherefore, we need to remove the redundant check for ptp->n_vclocks in\nptp_vclock_in_use() to prevent recursive locking."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ptp: eliminar la l\u00f3gica de comprobaci\u00f3n de ptp->n_vclocks en ptp_vclock_in_use(). No hay desacuerdo en que debemos comprobar tanto ptp->is_virtual_clock como ptp->n_vclocks para comprobar si el reloj virtual ptp est\u00e1 en uso. Sin embargo, al adquirir ptp->n_vclocks_mux para leer ptp->n_vclocks en ptp_vclock_in_use(), observamos un bloqueo recursivo en el seguimiento de llamadas a partir de n_vclocks_store(). ============================================== ADVERTENCIA: posible bloqueo recursivo detectado 6.15.0-rc6 #1 No contaminado -------------------------------------------- syz.0.1540/13807 est\u00e1 intentando adquirir el bloqueo: ffff888035a24868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, en: ptp_vclock_in_use drivers/ptp/ptp_private.h:103 [en l\u00ednea] ffff888035a24868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, en: ptp_clock_unregister+0x21/0x250 drivers/ptp/ptp_clock.c:415 pero la tarea ya tiene el bloqueo: ffff888030704868 (&ptp->n_vclocks_mux){+.+.}-{4:4}, en: n_vclocks_store+0xf1/0x6d0 drivers/ptp/ptp_sysfs.c:215 otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: Posible escenario de bloqueo inseguro: CPU0 ---- lock(&ptp->n_vclocks_mux); lock(&ptp->n_vclocks_mux); *** BLOQUEO INTERMEDIO *** .... ============================================== La mejor manera de resolver esto es eliminar la l\u00f3gica que comprueba ptp->n_vclocks en ptp_vclock_in_use(). Esto es apropiado porque cualquier ruta que use ptp->n_vclocks debe comprobar incondicionalmente si ptp->n_vclocks es mayor que 0 antes de anular el registro de vclocks, y todas las funciones ya est\u00e1n escritas de esta manera. En la funci\u00f3n que usa ptp->n_vclocks, ya obtenemos ptp->n_vclocks_mux antes de anular el registro de vclocks. Por lo tanto, necesitamos eliminar la comprobaci\u00f3n redundante de ptp->n_vclocks en ptp_vclock_in_use() para evitar el bloqueo recursivo."}], "id": "CVE-2025-38305", "lastModified": "2025-12-19T17:58:01.803", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-10T08:15:29.320", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/259119595227fd20f6aa29d85abe086b6fdd9eb1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d217e7031a5c06d366580fc6ddbf43527b780d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/87f7ce260a3c838b49e1dc1ceedf1006795157a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b1b73c452331451020be3bf4b014901015ae6663"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b93e6fef4eda48e17d9c642b9abad98a066fd4a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ef8fc007c28a30a4c0d90bf755e0f343d99bb392"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ptp: remove ptp->n_vclocks check logic in ptp_vclock_in_use()", "id": "2379182", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2379182"}, "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": ["No description is available for this CVE."], "name": "CVE-2025-38305", "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": "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": "2025-07-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38305\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38305\nhttps://lore.kernel.org/linux-cve-announce/2025071014-CVE-2025-38305-4ad3@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-13T11:06:33.181412+00:00", "updated": "2025-07-13T11:06:33.181464+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}