ptp: ocp: fix use-after-free bugs causing by ptp_ocp_watchdog
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.
CVE-2025-39859
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-39859
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "773bda96492153e11d21eb63ac814669b51fc701",
"lessThan": "e2a6eabe5304a789b7d40ce2576cd80154255e51",
"versionType": "git"
},
{
"status": "affected",
"version": "773bda96492153e11d21eb63ac814669b51fc701",
"lessThan": "aad70bdfc8244616e48c434310cab241a3f17781",
"versionType": "git"
},
{
"status": "affected",
"version": "773bda96492153e11d21eb63ac814669b51fc701",
"lessThan": "f10d3c7267ac7387a5129d5506c3c5f2460cfd9b",
"versionType": "git"
},
{
"status": "affected",
"version": "773bda96492153e11d21eb63ac814669b51fc701",
"lessThan": "8bf935cf789872350b04c1a6468b0a509f67afb2",
"versionType": "git"
}
],
"programFiles": [
"drivers/ptp/ptp_ocp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.16.6",
"versionType": "semver",
"lessThanOrEqual": "6.16.*"
},
{
"status": "unaffected",
"version": "6.17",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/ptp/ptp_ocp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-39859
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46025 · Revision 1
- Added to Heist Feed
- Publisher date