CVE-2025-39859 (GCVE-0-2025-39859)
Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2026-01-14 19:23
VLAI?
Title
ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog
Summary
In the Linux kernel, the following vulnerability has been resolved:
ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog
The ptp_ocp_detach() only shuts down the watchdog timer if it is
pending. However, if the timer handler is already running, the
timer_delete_sync() is not called. This leads to race conditions
where the devlink that contains the ptp_ocp is deallocated while
the timer handler is still accessing it, resulting in use-after-free
bugs. The following details one of the race scenarios.
(thread 1) | (thread 2)
ptp_ocp_remove() |
ptp_ocp_detach() | ptp_ocp_watchdog()
if (timer_pending(&bp->watchdog))| bp = timer_container_of()
timer_delete_sync() |
|
devlink_free(devlink) //free |
| bp-> //use
Resolve this by unconditionally calling timer_delete_sync() to ensure
the timer is reliably deactivated, preventing any access after free.
Severity ?
7.8 (High)
CWE
- CWE-416 - Use After Free
Assigner
References
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"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"
}
},
{
"other": {
"content": {
"id": "CVE-2025-39859",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-14T19:22:59.022358Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-01-14T19:23:13.413Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/ptp/ptp_ocp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "f10d3c7267ac7387a5129d5506c3c5f2460cfd9b",
"status": "affected",
"version": "773bda96492153e11d21eb63ac814669b51fc701",
"versionType": "git"
},
{
"lessThan": "8bf935cf789872350b04c1a6468b0a509f67afb2",
"status": "affected",
"version": "773bda96492153e11d21eb63ac814669b51fc701",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/ptp/ptp_ocp.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"lessThan": "5.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.6",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17",
"versionStartIncluding": "5.15",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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(\u0026bp-\u003ewatchdog))| bp = timer_container_of()\n timer_delete_sync() |\n |\n devlink_free(devlink) //free |\n | bp-\u003e //use\n\nResolve this by unconditionally calling timer_delete_sync() to ensure\nthe timer is reliably deactivated, preventing any access after free."
}
],
"providerMetadata": {
"dateUpdated": "2025-09-29T06:01:13.595Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/f10d3c7267ac7387a5129d5506c3c5f2460cfd9b"
},
{
"url": "https://git.kernel.org/stable/c/8bf935cf789872350b04c1a6468b0a509f67afb2"
}
],
"title": "ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39859",
"datePublished": "2025-09-19T15:26:29.717Z",
"dateReserved": "2025-04-16T07:20:57.143Z",
"dateUpdated": "2026-01-14T19:23:13.413Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"cna\": {\"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-09-29T06:01:13.595Z\"}, \"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(\u0026bp-\u003ewatchdog))| bp = timer_container_of()\\n timer_delete_sync() |\\n |\\n devlink_free(devlink) //free |\\n | bp-\u003e //use\\n\\nResolve this by unconditionally calling timer_delete_sync() to ensure\\nthe timer is reliably deactivated, preventing any access after free.\"}], \"affected\": [{\"product\": \"Linux\", \"vendor\": \"Linux\", \"defaultStatus\": \"unaffected\", \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"programFiles\": [\"drivers/ptp/ptp_ocp.c\"], \"versions\": [{\"version\": \"773bda96492153e11d21eb63ac814669b51fc701\", \"lessThan\": \"f10d3c7267ac7387a5129d5506c3c5f2460cfd9b\", \"status\": \"affected\", \"versionType\": \"git\"}, {\"version\": \"773bda96492153e11d21eb63ac814669b51fc701\", \"lessThan\": \"8bf935cf789872350b04c1a6468b0a509f67afb2\", \"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_ocp.c\"], \"versions\": [{\"version\": \"5.15\", \"status\": \"affected\"}, {\"version\": \"0\", \"lessThan\": \"5.15\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.16.6\", \"lessThanOrEqual\": \"6.16.*\", \"status\": \"unaffected\", \"versionType\": \"semver\"}, {\"version\": \"6.17\", \"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\": \"5.15\", \"versionEndExcluding\": \"6.16.6\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.15\", \"versionEndExcluding\": \"6.17\"}]}]}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f10d3c7267ac7387a5129d5506c3c5f2460cfd9b\"}, {\"url\": \"https://git.kernel.org/stable/c/8bf935cf789872350b04c1a6468b0a509f67afb2\"}], \"title\": \"ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog\", \"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\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-14T19:22:53.850Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2025-39859\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2025-04-16T07:20:57.143Z\", \"datePublished\": \"2025-09-19T15:26:29.717Z\", \"dateUpdated\": \"2026-01-14T19:23:13.413Z\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…