CVE-2026-74604 (GCVE-0-2026-74604)
Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-10-16 19:06
VLAI
EPSS
VEX
Title
Revert "thermal/drivers/hwmon: Cleanup coding style a bit"
Summary
In the Linux kernel, the following vulnerability has been resolved:
Revert "thermal/drivers/hwmon: Cleanup coding style a bit"
Revert commit 030a48b0f6ce ("thermal/drivers/hwmon: Cleanup coding style
a bit") that introduced a use-after-free into the error path of
thermal_add_hwmon_sysfs() by removing a valid check from it.
Severity
8.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 19:02 UTC
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 2434f4765da8ccd7ef31be88b86f1bfa2e95be11
(git)
Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < b4c01ae6dd56d9dfd96bd1b29c28afa8fa06b366 (git) Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 999e573212d5f1debf073c68be35e55bbfad12fc (git) Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 6a48ee9a5bda0f8ee501f9bef159fb9f39ff519a (git) Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 8d34019d1413629a434a7e8d9f91c76d256196a0 (git) Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < 6b446d335ba16e93a266dd77adf1ba51abc82df4 (git) Affected: 030a48b0f6ce393d78b8d33debb1e2043b8cc156 , < ff8da20b6f47c48d46e47f93f7a59e2d56ee9107 (git) |
guessed | |
| Linux | Linux |
Affected:
5.11
Unaffected: 0 , < 5.11 (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"version": "030a48b0f6ce393d78b8d33debb1e2043b8cc156",
"versionType": "git"
},
{
"lessThan": "999e573212d5f1debf073c68be35e55bbfad12fc",
"status": "affected",
"version": "030a48b0f6ce393d78b8d33debb1e2043b8cc156",
"versionType": "git"
},
{
"lessThan": "6a48ee9a5bda0f8ee501f9bef159fb9f39ff519a",
"status": "affected",
"version": "030a48b0f6ce393d78b8d33debb1e2043b8cc156",
"versionType": "git"
},
{
"lessThan": "8d34019d1413629a434a7e8d9f91c76d256196a0",
"status": "affected",
"version": "030a48b0f6ce393d78b8d33debb1e2043b8cc156",
"versionType": "git"
},
{
"lessThan": "6b446d335ba16e93a266dd77adf1ba51abc82df4",
"status": "affected",
"version": "030a48b0f6ce393d78b8d33debb1e2043b8cc156",
"versionType": "git"
},
{
"lessThan": "ff8da20b6f47c48d46e47f93f7a59e2d56ee9107",
"status": "affected",
"version": "030a48b0f6ce393d78b8d33debb1e2043b8cc156",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/thermal/thermal_hwmon.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.11"
},
{
"lessThan": "5.11",
"status": "unaffected",
"version": "0",
"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": "6.6.152",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.9",
"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": "5.15.216",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.152",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.104",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.45",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.9",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.11",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"thermal/drivers/hwmon: Cleanup coding style a bit\"\n\nRevert commit 030a48b0f6ce (\"thermal/drivers/hwmon: Cleanup coding style\na bit\") that introduced a use-after-free into the error path of\nthermal_add_hwmon_sysfs() by removing a valid check from it."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is in thermal_add_hwmon_sysfs() during thermal zone/hwmon driver registration; it is only reachable from kernel thermal driver probe/init paths, not from network protocols or physical buses.\nAC:L - When a second thermal zone shares an existing hwmon type and registration fails, the error path deterministically kfree()s a still-linked hwmon object, leaving a dangling entry that any later sysfs access can hit without winning a race.\nPR:N - No privileges are needed to exploit the resulting UAF: hwmon temp attributes are world-readable (0444) and unprivileged local processes routinely read /sys/class/hwmon on phones, servers, and embedded devices after latent corruption during multi-sensor thermal probe.\nUI:N - Exploitation requires no victim interaction beyond normal system operation; reading thermal sensors or subsequent kernel hwmon operations can trigger use of the freed object automatically.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the host kernel; it does not cross VM, container, or IOMMU security boundaries by itself.\nC:H - The use-after-free of struct thermal_hwmon_device leaves a dangling list entry and device pointer; subsequent sysfs reads or thermal hwmon operations can dereference attacker-influencable freed heap memory, enabling arbitrary kernel memory disclosure.\nI:H - Heap UAF on a long-lived thermal_hwmon_device structure adjacent to list pointers and device objects provides standard kernel heap corruption primitives that can be developed into arbitrary write and local privilege escalation.\nA:H - Use-after-free in kernel thermal/hwmon registration can cause immediate kernel oops/panic on access to the freed hwmon device, and repeated or concurrent sysfs access can reliably crash or hang the system."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-25T05:40:28.622Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2434f4765da8ccd7ef31be88b86f1bfa2e95be11"
},
{
"url": "https://git.kernel.org/stable/c/b4c01ae6dd56d9dfd96bd1b29c28afa8fa06b366"
},
{
"url": "https://git.kernel.org/stable/c/999e573212d5f1debf073c68be35e55bbfad12fc"
},
{
"url": "https://git.kernel.org/stable/c/6a48ee9a5bda0f8ee501f9bef159fb9f39ff519a"
},
{
"url": "https://git.kernel.org/stable/c/8d34019d1413629a434a7e8d9f91c76d256196a0"
},
{
"url": "https://git.kernel.org/stable/c/6b446d335ba16e93a266dd77adf1ba51abc82df4"
},
{
"url": "https://git.kernel.org/stable/c/ff8da20b6f47c48d46e47f93f7a59e2d56ee9107"
}
],
"title": "Revert \"thermal/drivers/hwmon: Cleanup coding style a bit\"",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74604",
"datePublished": "2026-08-22T15:31:52.295Z",
"dateReserved": "2026-08-15T05:44:03.919Z",
"dateUpdated": "2026-10-16T19:06:00.603Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.