CVE-2026-74566 (GCVE-0-2026-74566)
Vulnerability from cvelistv5 – Published: 2026-08-15 12:28 – Updated: 2026-08-19 16:39
VLAI
EPSS
VEX
Title
keys: make keyring key-chunk byte order agree with keyring_diff_objects()
Summary
In the Linux kernel, the following vulnerability has been resolved:
keys: make keyring key-chunk byte order agree with keyring_diff_objects()
keyring_get_key_chunk() loads description bytes into the index chunk low
address first, while keyring_diff_objects() numbers the first differing
bit from the low end and folds the absolute byte index into the level
without removing the inline-prefix offset the level already carries.
The two disagree on byte order and bit position, so the array can be
told two keys first differ at a bit that does not differ in the chunk
the walker uses, letting crafted descriptions collide into one node.
Load the chunk in the order keyring_diff_objects() assumes and drop the
inline-prefix length when folding the byte index into the level. This
only changes the in-memory ordering used to place keys within a keyring;
add, search and read of non-colliding keys are unaffected.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f771fde82051976a6fc0fd570f8b86de4a92124b , < 414bcf37d81ce9b3823aabc06b04c97fdcbe489b
(git)
Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < abe43c661efb753d5ee35ad8ace4bbb16fa9afd0 (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < f81920917074e3c4ad4fba06fe8c56738d010606 (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < bd0f976ef89dce6db458bf75bc2cf51127becc41 (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 7269df3e7fcfa308e6a456305162f7788747bdbd (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 3d9f16c0b643ceac305526b2e2fe25c2c6166926 (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 7e5397a3fed0dee7779bd084bec3c0584db3c930 (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 58565eef0f8d861aae92abfb7658458d661cee17 (git) |
guessed | |
| Linux | Linux |
Affected:
5.3
Unaffected: 0 , < 5.3 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"programFiles": [
"security/keys/keyring.c"
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"vendor": "Linux",
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{
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"version": "5.3"
},
{
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"version": "0",
"versionType": "semver"
},
{
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"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": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"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": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.151",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.103",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.44",
"versionStartIncluding": "5.3",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: make keyring key-chunk byte order agree with keyring_diff_objects()\n\nkeyring_get_key_chunk() loads description bytes into the index chunk low\naddress first, while keyring_diff_objects() numbers the first differing\nbit from the low end and folds the absolute byte index into the level\nwithout removing the inline-prefix offset the level already carries.\nThe two disagree on byte order and bit position, so the array can be\ntold two keys first differ at a bit that does not differ in the chunk\nthe walker uses, letting crafted descriptions collide into one node.\n\nLoad the chunk in the order keyring_diff_objects() assumes and drop the\ninline-prefix length when folding the byte index into the level. This\nonly changes the in-memory ordering used to place keys within a keyring;\nadd, search and read of non-colliding keys are unaffected."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:39:06.890Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/414bcf37d81ce9b3823aabc06b04c97fdcbe489b"
},
{
"url": "https://git.kernel.org/stable/c/abe43c661efb753d5ee35ad8ace4bbb16fa9afd0"
},
{
"url": "https://git.kernel.org/stable/c/f81920917074e3c4ad4fba06fe8c56738d010606"
},
{
"url": "https://git.kernel.org/stable/c/bd0f976ef89dce6db458bf75bc2cf51127becc41"
},
{
"url": "https://git.kernel.org/stable/c/7269df3e7fcfa308e6a456305162f7788747bdbd"
},
{
"url": "https://git.kernel.org/stable/c/3d9f16c0b643ceac305526b2e2fe25c2c6166926"
},
{
"url": "https://git.kernel.org/stable/c/7e5397a3fed0dee7779bd084bec3c0584db3c930"
},
{
"url": "https://git.kernel.org/stable/c/58565eef0f8d861aae92abfb7658458d661cee17"
}
],
"title": "keys: make keyring key-chunk byte order agree with keyring_diff_objects()",
"x_generator": {
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}
}
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"cveMetadata": {
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"cveId": "CVE-2026-74566",
"datePublished": "2026-08-15T12:28:07.628Z",
"dateReserved": "2026-08-15T05:44:03.917Z",
"dateUpdated": "2026-08-19T16:39:06.890Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-74566",
"date": "2026-10-05",
"epss": "0.00165",
"percentile": "0.05113"
},
"microsoft_vex": {
"current_release_date": "2026-09-25T02:32:04.000Z",
"cve": "CVE-2026-74566",
"id": "msrc_CVE-2026-74566",
"initial_release_date": "2026-08-23T15:02:56.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "keys: make keyring key-chunk byte order agree with keyring_diff_objects()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74566.json",
"version": "3"
},
"nvd": {
"cve": {
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{
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"product": "Linux",
"programFiles": [
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],
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"versionType": "git"
},
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"lessThan": "5.3",
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"version": "0",
"versionType": "semver"
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{
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"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": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.8",
"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\nkeys: make keyring key-chunk byte order agree with keyring_diff_objects()\n\nkeyring_get_key_chunk() loads description bytes into the index chunk low\naddress first, while keyring_diff_objects() numbers the first differing\nbit from the low end and folds the absolute byte index into the level\nwithout removing the inline-prefix offset the level already carries.\nThe two disagree on byte order and bit position, so the array can be\ntold two keys first differ at a bit that does not differ in the chunk\nthe walker uses, letting crafted descriptions collide into one node.\n\nLoad the chunk in the order keyring_diff_objects() assumes and drop the\ninline-prefix length when folding the byte index into the level. This\nonly changes the in-memory ordering used to place keys within a keyring;\nadd, search and read of non-colliding keys are unaffected."
}
],
"id": "CVE-2026-74566",
"lastModified": "2026-08-19T17:21:11.443",
"metrics": {},
"published": "2026-08-15T13:18:02.120",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3d9f16c0b643ceac305526b2e2fe25c2c6166926"
},
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"url": "https://git.kernel.org/stable/c/7269df3e7fcfa308e6a456305162f7788747bdbd"
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"url": "https://git.kernel.org/stable/c/7e5397a3fed0dee7779bd084bec3c0584db3c930"
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"url": "https://git.kernel.org/stable/c/abe43c661efb753d5ee35ad8ace4bbb16fa9afd0"
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{
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"url": "https://git.kernel.org/stable/c/bd0f976ef89dce6db458bf75bc2cf51127becc41"
},
{
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-21T08:08:26+00:00",
"cve": "CVE-2026-74566",
"id": "CVE-2026-74566",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_affected": "198",
"product_status:known_not_affected": "76",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: keys: make keyring key-chunk byte order agree with keyring_diff_objects()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74566.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-03T00:24:23Z",
"cve": "CVE-2026-74566",
"id": "CVE-2026-74566",
"initial_release_date": "2026-08-15T23:50:02Z",
"product_status:known_affected": "628",
"product_status:known_not_affected": "93",
"product_status:recommended": "252",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-74566",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74566.json",
"version": "12"
}
}
}
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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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