CVE-2026-68357 (GCVE-0-2026-68357)
Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-19 16:34
VLAI
EPSS
VEX
Title
watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()
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.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
da0d12ff2b829a35e9921918e925d79497b82bef , < b9ae33faa96bdec6bc60e4c5f8f53786182e4207
(git)
Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 472ec1e34ff0bb26379805cae808f658cce58c35 (git) Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 7a2ee3ec6f208307eca1119a343c7b5d39c03708 (git) Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 2e47b91b9b4020fcc01def14d6b6556d66074cf4 (git) Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 0ca252720f0e38411cfec3431db9bb1aed0a412c (git) Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 7d1658b066de30f4b23afc14814d22416a971e6e (git) Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 7993d626983cc58fbde9607333cfd2d57725c197 (git) Affected: da0d12ff2b829a35e9921918e925d79497b82bef , < 7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661 (git) |
guessed | |
| Linux | Linux |
Affected:
4.9
Unaffected: 0 , < 4.9 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/watchdog/watchdog_pretimeout.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b9ae33faa96bdec6bc60e4c5f8f53786182e4207",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "472ec1e34ff0bb26379805cae808f658cce58c35",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "7a2ee3ec6f208307eca1119a343c7b5d39c03708",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "2e47b91b9b4020fcc01def14d6b6556d66074cf4",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "0ca252720f0e38411cfec3431db9bb1aed0a412c",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "7d1658b066de30f4b23afc14814d22416a971e6e",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "7993d626983cc58fbde9607333cfd2d57725c197",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/watchdog/watchdog_pretimeout.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.9"
},
{
"lessThan": "4.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.148",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.101",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.6",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"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": [
{
"url": "https://git.kernel.org/stable/c/b9ae33faa96bdec6bc60e4c5f8f53786182e4207"
},
{
"url": "https://git.kernel.org/stable/c/472ec1e34ff0bb26379805cae808f658cce58c35"
},
{
"url": "https://git.kernel.org/stable/c/7a2ee3ec6f208307eca1119a343c7b5d39c03708"
},
{
"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()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"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",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-68357",
"date": "2026-09-30",
"epss": "0.0022",
"percentile": "0.11252"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/watchdog/watchdog_pretimeout.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b9ae33faa96bdec6bc60e4c5f8f53786182e4207",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "472ec1e34ff0bb26379805cae808f658cce58c35",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "7a2ee3ec6f208307eca1119a343c7b5d39c03708",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "2e47b91b9b4020fcc01def14d6b6556d66074cf4",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "0ca252720f0e38411cfec3431db9bb1aed0a412c",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "7d1658b066de30f4b23afc14814d22416a971e6e",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "7993d626983cc58fbde9607333cfd2d57725c197",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
},
{
"lessThan": "7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661",
"status": "affected",
"version": "da0d12ff2b829a35e9921918e925d79497b82bef",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/watchdog/watchdog_pretimeout.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.9"
},
{
"lessThan": "4.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"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."
}
],
"id": "CVE-2026-68357",
"lastModified": "2026-08-19T17:20:45.310",
"metrics": {},
"published": "2026-08-10T13:20:28.160",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0ca252720f0e38411cfec3431db9bb1aed0a412c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2e47b91b9b4020fcc01def14d6b6556d66074cf4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/472ec1e34ff0bb26379805cae808f658cce58c35"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7362ba0f9c96ac3ad6a2ca3995bd9fc9a28a8661"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7993d626983cc58fbde9607333cfd2d57725c197"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7a2ee3ec6f208307eca1119a343c7b5d39c03708"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7d1658b066de30f4b23afc14814d22416a971e6e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b9ae33faa96bdec6bc60e4c5f8f53786182e4207"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-11T12:30:10+00:00",
"cve": "CVE-2026-68357",
"id": "CVE-2026-68357",
"initial_release_date": "2026-08-10T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: watchdog: pretimeout: Fix UAF in watchdog_unregister_governor()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68357.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-23T00:20:11Z",
"cve": "CVE-2026-68357",
"id": "CVE-2026-68357",
"initial_release_date": "2026-08-11T23:46:30Z",
"product_status:first_fixed": "68",
"product_status:known_affected": "615",
"product_status:known_not_affected": "62",
"product_status:recommended": "130",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-68357",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68357.json",
"version": "11"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…