CVE-2025-40346 (GCVE-0-2025-40346)
Vulnerability from cvelistv5 – Published: 2025-12-16 13:30 – Updated: 2026-05-11 21:47
VLAI
EPSS
VEX
Title
arch_topology: Fix incorrect error check in topology_parse_cpu_capacity()
Summary
In the Linux kernel, the following vulnerability has been resolved:
arch_topology: Fix incorrect error check in topology_parse_cpu_capacity()
Fix incorrect use of PTR_ERR_OR_ZERO() in topology_parse_cpu_capacity()
which causes the code to proceed with NULL clock pointers. The current
logic uses !PTR_ERR_OR_ZERO(cpu_clk) which evaluates to true for both
valid pointers and NULL, leading to potential NULL pointer dereference
in clk_get_rate().
Per include/linux/err.h documentation, PTR_ERR_OR_ZERO(ptr) returns:
"The error code within @ptr if it is an error pointer; 0 otherwise."
This means PTR_ERR_OR_ZERO() returns 0 for both valid pointers AND NULL
pointers. Therefore !PTR_ERR_OR_ZERO(cpu_clk) evaluates to true (proceed)
when cpu_clk is either valid or NULL, causing clk_get_rate(NULL) to be
called when of_clk_get() returns NULL.
Replace with !IS_ERR_OR_NULL(cpu_clk) which only proceeds for valid
pointers, preventing potential NULL pointer dereference in clk_get_rate().
Severity
No CVSS data available.
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 64da320252e43456cc9ec3055ff567f168467b37
(git)
Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 02fbea0864fd4a863671f5d418129258d7159f68 (git) Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < a77f8434954cb1e9c42c3854e40855fdcf5ab235 (git) Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 3373f263bb647fcc3b5237cfaef757633b9ee25e (git) Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 45379303124487db3a81219af7565d41f498167f (git) Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 3a01b2614e84361aa222f67bc628593987e5cdb2 (git) Affected: b8fe128dad8f97cc9af7c55a264d1fc5ab677195 , < 2eead19334516c8e9927c11b448fbe512b1f18a1 (git) |
guessed | |
| Linux | Linux |
Affected:
5.7
Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.246 , ≤ 5.10.* (semver) Unaffected: 5.15.196 , ≤ 5.15.* (semver) Unaffected: 6.1.158 , ≤ 6.1.* (semver) Unaffected: 6.6.115 , ≤ 6.6.* (semver) Unaffected: 6.12.56 , ≤ 6.12.* (semver) Unaffected: 6.17.6 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"product": "Linux",
"programFiles": [
"drivers/base/arch_topology.c"
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/base/arch_topology.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.7"
},
{
"lessThan": "5.7",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.246",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.196",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.115",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.56",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.246",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.115",
"versionStartIncluding": "5.7",
"vulnerable": true
},
{
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"versionEndExcluding": "6.12.56",
"versionStartIncluding": "5.7",
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},
{
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"versionEndExcluding": "6.17.6",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18",
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}
],
"negate": false,
"operator": "OR"
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]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\narch_topology: Fix incorrect error check in topology_parse_cpu_capacity()\n\nFix incorrect use of PTR_ERR_OR_ZERO() in topology_parse_cpu_capacity()\nwhich causes the code to proceed with NULL clock pointers. The current\nlogic uses !PTR_ERR_OR_ZERO(cpu_clk) which evaluates to true for both\nvalid pointers and NULL, leading to potential NULL pointer dereference\nin clk_get_rate().\n\nPer include/linux/err.h documentation, PTR_ERR_OR_ZERO(ptr) returns:\n\"The error code within @ptr if it is an error pointer; 0 otherwise.\"\n\nThis means PTR_ERR_OR_ZERO() returns 0 for both valid pointers AND NULL\npointers. Therefore !PTR_ERR_OR_ZERO(cpu_clk) evaluates to true (proceed)\nwhen cpu_clk is either valid or NULL, causing clk_get_rate(NULL) to be\ncalled when of_clk_get() returns NULL.\n\nReplace with !IS_ERR_OR_NULL(cpu_clk) which only proceeds for valid\npointers, preventing potential NULL pointer dereference in clk_get_rate()."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T21:47:35.335Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/64da320252e43456cc9ec3055ff567f168467b37"
},
{
"url": "https://git.kernel.org/stable/c/02fbea0864fd4a863671f5d418129258d7159f68"
},
{
"url": "https://git.kernel.org/stable/c/a77f8434954cb1e9c42c3854e40855fdcf5ab235"
},
{
"url": "https://git.kernel.org/stable/c/3373f263bb647fcc3b5237cfaef757633b9ee25e"
},
{
"url": "https://git.kernel.org/stable/c/45379303124487db3a81219af7565d41f498167f"
},
{
"url": "https://git.kernel.org/stable/c/3a01b2614e84361aa222f67bc628593987e5cdb2"
},
{
"url": "https://git.kernel.org/stable/c/2eead19334516c8e9927c11b448fbe512b1f18a1"
}
],
"title": "arch_topology: Fix incorrect error check in topology_parse_cpu_capacity()",
"x_generator": {
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"cveId": "CVE-2025-40346",
"datePublished": "2025-12-16T13:30:20.395Z",
"dateReserved": "2025-04-16T07:20:57.187Z",
"dateUpdated": "2026-05-11T21:47:35.335Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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"date": "2026-09-29",
"epss": "0.00205",
"percentile": "0.09391"
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{
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"version": "6.1.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.115",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.56",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.17.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
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"version": "6.18",
"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\narch_topology: Fix incorrect error check in topology_parse_cpu_capacity()\n\nFix incorrect use of PTR_ERR_OR_ZERO() in topology_parse_cpu_capacity()\nwhich causes the code to proceed with NULL clock pointers. The current\nlogic uses !PTR_ERR_OR_ZERO(cpu_clk) which evaluates to true for both\nvalid pointers and NULL, leading to potential NULL pointer dereference\nin clk_get_rate().\n\nPer include/linux/err.h documentation, PTR_ERR_OR_ZERO(ptr) returns:\n\"The error code within @ptr if it is an error pointer; 0 otherwise.\"\n\nThis means PTR_ERR_OR_ZERO() returns 0 for both valid pointers AND NULL\npointers. Therefore !PTR_ERR_OR_ZERO(cpu_clk) evaluates to true (proceed)\nwhen cpu_clk is either valid or NULL, causing clk_get_rate(NULL) to be\ncalled when of_clk_get() returns NULL.\n\nReplace with !IS_ERR_OR_NULL(cpu_clk) which only proceeds for valid\npointers, preventing potential NULL pointer dereference in clk_get_rate()."
}
],
"id": "CVE-2025-40346",
"lastModified": "2026-06-17T09:21:41.640",
"metrics": {},
"published": "2025-12-16T14:15:46.337",
"references": [
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],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-30T10:26:03+00:00",
"cve": "CVE-2025-40346",
"id": "CVE-2025-40346",
"initial_release_date": "2025-12-16T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: arch_topology: Fix incorrect error check in topology_parse_cpu_capacity()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40346.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-19T02:05:20Z",
"cve": "CVE-2025-40346",
"id": "CVE-2025-40346",
"initial_release_date": "2025-12-17T00:30:39Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "610",
"product_status:known_not_affected": "260",
"product_status:recommended": "289",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-40346",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40346.json",
"version": "40"
}
}
}
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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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