CVE-2026-68357 (GCVE-0-2026-68357)
Vulnerability from cvelistv5
Published
2026-08-10 12:03
Modified
2026-08-19 16:34
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: da0d12ff2b829a35e9921918e925d79497b82bef Version: da0d12ff2b829a35e9921918e925d79497b82bef Version: da0d12ff2b829a35e9921918e925d79497b82bef Version: da0d12ff2b829a35e9921918e925d79497b82bef Version: da0d12ff2b829a35e9921918e925d79497b82bef Version: da0d12ff2b829a35e9921918e925d79497b82bef Version: da0d12ff2b829a35e9921918e925d79497b82bef Version: da0d12ff2b829a35e9921918e925d79497b82bef |
||
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"descriptions": [
{
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: pretimeout: Fix UAF in watchdog_unregister_governor()\n\nWhen a watchdog governor is unregistered, it updates existing watchdog\ndevices that were using this governor by falling back to `default_gov`.\n\nIf the governor being unregistered is currently set as `default_gov`,\nthe `default_gov` is never cleared. This leads to 2 use-after-free\nissues:\n1. New watchdog devices registered after this point will inherit the\n dangling `default_gov`.\n2. Existing watchdog devices using the unregistered governor will have\n their `wdd-\u003egov` reassigned to the dangling `default_gov`.\n\nFix the UAF by clearing `default_gov` if it matches the governor being\nunregistered."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:34:05.347Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
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"url": "https://git.kernel.org/stable/c/b9ae33faa96bdec6bc60e4c5f8f53786182e4207"
},
{
"url": "https://git.kernel.org/stable/c/472ec1e34ff0bb26379805cae808f658cce58c35"
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{
"url": "https://git.kernel.org/stable/c/7a2ee3ec6f208307eca1119a343c7b5d39c03708"
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{
"url": "https://git.kernel.org/stable/c/2e47b91b9b4020fcc01def14d6b6556d66074cf4"
},
{
"url": "https://git.kernel.org/stable/c/0ca252720f0e38411cfec3431db9bb1aed0a412c"
},
{
"url": "https://git.kernel.org/stable/c/7d1658b066de30f4b23afc14814d22416a971e6e"
},
{
"url": "https://git.kernel.org/stable/c/7993d626983cc58fbde9607333cfd2d57725c197"
},
{
"url": "https://git.kernel.org/stable/c/7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661"
}
],
"title": "watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()",
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"cveId": "CVE-2026-68357",
"datePublished": "2026-08-10T12:03:34.241Z",
"dateReserved": "2026-07-30T09:28:09.385Z",
"dateUpdated": "2026-08-19T16:34:05.347Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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