{"id":"CVE-2025-39859","state":"PUBLISHED","title":"ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog\n\nThe ptp_ocp_detach() only shuts down the watchdog timer if it is\npending. However, if the timer handler is already running, the\ntimer_delete_sync() is not called. This leads to race conditions\nwhere the devlink that contains the ptp_ocp is deallocated while\nthe timer handler is still accessing it, resulting in use-after-free\nbugs. The following details one of the race scenarios.\n\n(thread 1)                           | (thread 2)\nptp_ocp_remove()                     |\n  ptp_ocp_detach()                   | ptp_ocp_watchdog()\n    if (timer_pending(&bp->watchdog))|   bp = timer_container_of()\n      timer_delete_sync()            |\n                                     |\n  devlink_free(devlink) //free       |\n                                     |   bp-> //use\n\nResolve this by unconditionally calling timer_delete_sync() to ensure\nthe timer is reliably deactivated, preventing any access after free.","publishedAt":"2025-09-19T15:26:29.717Z","updatedAt":"2026-10-30T12:22:34.215Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"a59822a762039b6e0252f21b091245d6ad7f324b","versionType":"git"},{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"e2a6eabe5304a789b7d40ce2576cd80154255e51","versionType":"git"},{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"aad70bdfc8244616e48c434310cab241a3f17781","versionType":"git"},{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"f10d3c7267ac7387a5129d5506c3c5f2460cfd9b","versionType":"git"},{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"8bf935cf789872350b04c1a6468b0a509f67afb2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/ptp/ptp_ocp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.16.6","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/ptp/ptp_ocp.c"]}],"references":["https://git.kernel.org/stable/c/a59822a762039b6e0252f21b091245d6ad7f324b","https://git.kernel.org/stable/c/e2a6eabe5304a789b7d40ce2576cd80154255e51","https://git.kernel.org/stable/c/aad70bdfc8244616e48c434310cab241a3f17781","https://git.kernel.org/stable/c/f10d3c7267ac7387a5129d5506c3c5f2460cfd9b","https://git.kernel.org/stable/c/8bf935cf789872350b04c1a6468b0a509f67afb2"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-30T12:40:04.423Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/39xxx/CVE-2025-39859.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39859","state":"PUBLISHED","datePublished":"2025-09-19T15:26:29.717Z","dateUpdated":"2026-10-30T12:22:34.215Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.143Z"},"containers":{"cna":{"title":"ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog\n\nThe ptp_ocp_detach() only shuts down the watchdog timer if it is\npending. However, if the timer handler is already running, the\ntimer_delete_sync() is not called. This leads to race conditions\nwhere the devlink that contains the ptp_ocp is deallocated while\nthe timer handler is still accessing it, resulting in use-after-free\nbugs. The following details one of the race scenarios.\n\n(thread 1)                           | (thread 2)\nptp_ocp_remove()                     |\n  ptp_ocp_detach()                   | ptp_ocp_watchdog()\n    if (timer_pending(&bp->watchdog))|   bp = timer_container_of()\n      timer_delete_sync()            |\n                                     |\n  devlink_free(devlink) //free       |\n                                     |   bp-> //use\n\nResolve this by unconditionally calling timer_delete_sync() to ensure\nthe timer is reliably deactivated, preventing any access after free."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"a59822a762039b6e0252f21b091245d6ad7f324b","versionType":"git"},{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"e2a6eabe5304a789b7d40ce2576cd80154255e51","versionType":"git"},{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"aad70bdfc8244616e48c434310cab241a3f17781","versionType":"git"},{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"f10d3c7267ac7387a5129d5506c3c5f2460cfd9b","versionType":"git"},{"version":"773bda96492153e11d21eb63ac814669b51fc701","status":"affected","lessThan":"8bf935cf789872350b04c1a6468b0a509f67afb2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/ptp/ptp_ocp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.16.6","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/ptp/ptp_ocp.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a59822a762039b6e0252f21b091245d6ad7f324b"},{"url":"https://git.kernel.org/stable/c/e2a6eabe5304a789b7d40ce2576cd80154255e51"},{"url":"https://git.kernel.org/stable/c/aad70bdfc8244616e48c434310cab241a3f17781"},{"url":"https://git.kernel.org/stable/c/f10d3c7267ac7387a5129d5506c3c5f2460cfd9b"},{"url":"https://git.kernel.org/stable/c/8bf935cf789872350b04c1a6468b0a509f67afb2"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:22:34.215Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.16.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.17"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"id":"CVE-2025-39859","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-01-14T19:22:59.022358Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-14T19:23:13.413Z"}}]}}}