CVE-2026-46021 (GCVE-0-2026-46021)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:56 – Updated: 2026-09-08 08:49
VLAI
EPSS
VEX
Title
thermal: core: Fix thermal zone governor cleanup issues
Summary
In the Linux kernel, the following vulnerability has been resolved:
thermal: core: Fix thermal zone governor cleanup issues
If thermal_zone_device_register_with_trips() fails after adding
a thermal governor to the thermal zone being registered, the
governor is not removed from it as appropriate which may lead to
a memory leak.
In turn, thermal_zone_device_unregister() calls thermal_set_governor()
without acquiring the thermal zone lock beforehand which may race with
a governor update via sysfs and may lead to a use-after-free in that
case.
Address these issues by adding two thermal_set_governor() calls, one to
thermal_release() to remove the governor from the given thermal zone,
and one to the thermal zone registration error path to cover failures
preceding the thermal zone device registration.
Severity
5.5 (Medium)
Assigner
References
9 references
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8 , < a172fa18bc370b776ac1510abb0dcb50a7a35fac
(git)
Affected: e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8 , < 8e563d8db50f303171aceb79eec0807e7ba06951 (git) Affected: e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8 , < d4eb861adde5ce22e459fbd29366f47bb2167977 (git) Affected: e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8 , < 37a430a2d4e66ec8238da6c7f7e48809bf265e13 (git) Affected: e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8 , < f412e541d25a3dfaf3d53e012ade6ff03cae8a45 (git) Affected: e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8 , < 75f8f3c3e09122270986de9d7aa347d701676761 (git) Affected: e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8 , < 64d4ebf91d082034bbc5ae3ba2d7fd800bc02d06 (git) Affected: e33df1d2f3a0141cd79e770f31999ba0dd7ebfa8 , < 41ff66baf81c6541f4f985dd7eac4494d03d9440 (git) |
guessed | |
| Linux | Linux |
Affected:
4.2
Unaffected: 0 , < 4.2 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed |
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"url": "https://git.kernel.org/stable/c/37a430a2d4e66ec8238da6c7f7e48809bf265e13"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/41ff66baf81c6541f4f985dd7eac4494d03d9440"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/64d4ebf91d082034bbc5ae3ba2d7fd800bc02d06"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/75f8f3c3e09122270986de9d7aa347d701676761"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8e563d8db50f303171aceb79eec0807e7ba06951"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/a172fa18bc370b776ac1510abb0dcb50a7a35fac"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d4eb861adde5ce22e459fbd29366f47bb2167977"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/f412e541d25a3dfaf3d53e012ade6ff03cae8a45"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-401"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T06:45:54+00:00",
"cve": "CVE-2026-46021",
"id": "CVE-2026-46021",
"initial_release_date": "2026-05-27T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: thermal: core: Fix thermal zone governor cleanup issues",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46021.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-19T01:55:52Z",
"cve": "CVE-2026-46021",
"id": "CVE-2026-46021",
"initial_release_date": "2026-05-28T03:54:14Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "500",
"product_status:known_not_affected": "4",
"product_status:recommended": "503",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46021",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46021.json",
"version": "26"
}
}
}
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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.
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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.
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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.
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