watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()
In the Linux kernel, the following vulnerability has been resolved: watchdog: pretimeout: Fix UAF in watchdog_unregister_governor() When a watchdog governor is unregistered, it updates existing watchdog devices that were using this governor by falling back to `default_gov`. If the governor being unregistered is currently set as `default_gov`, the `default_gov` is never cleared. This leads to 2 use-after-free issues: 1. New watchdog devices registered after this point will inherit the dangling `default_gov`. 2. Existing watchdog devices using the unregistered governor will have their `wdd->gov` reassigned to the dangling `default_gov`. Fix the UAF by clearing `default_gov` if it matches the governor being unregistered.
CVE-2026-68357
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: osv:CVE-2026-68357
Kernel
Source reference: /affected/1/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 5.10.265
Source reference:
/affected/1/ranges5.15.216Source reference:
/affected/1/ranges6.1.183Source reference:
/affected/1/ranges6.6.148Source reference:
/affected/1/ranges6.12.101Source reference:
/affected/1/ranges6.18.42Source reference:
/affected/1/ranges7.1.6Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "da0d12ff2b829a35e9921918e925d79497b82bef"
},
{
"fixed": "b9ae33faa96bdec6bc60e4c5f8f53786182e4207"
},
{
"fixed": "472ec1e34ff0bb26379805cae808f658cce58c35"
},
{
"fixed": "7a2ee3ec6f208307eca1119a343c7b5d39c03708"
},
{
"fixed": "2e47b91b9b4020fcc01def14d6b6556d66074cf4"
},
{
"fixed": "0ca252720f0e38411cfec3431db9bb1aed0a412c"
},
{
"fixed": "7d1658b066de30f4b23afc14814d22416a971e6e"
},
{
"fixed": "7993d626983cc58fbde9607333cfd2d57725c197"
},
{
"fixed": "7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661"
}
]
}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68357.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.9.0"
},
{
"fixed": "5.10.265"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.11.0"
},
{
"fixed": "5.15.216"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.16.0"
},
{
"fixed": "6.1.183"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.148"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
},
{
"fixed": "6.12.101"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.18.42"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
},
{
"fixed": "7.1.6"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68357.json"
}
}
]- Related CVEs
- CVE-2026-68357
Source reference:
/id
Publisher severity
No explicit severity was provided.
- Event
- #50782 · Revision 1
- Added to Heist Feed
- Publisher date