CVE-2026-74567 (GCVE-0-2026-74567)
Vulnerability from cvelistv5 – Published: 2026-08-15 12:28 – Updated: 2026-08-19 16:39
VLAI
EPSS
VEX
Title
keys: fix out-of-bounds read in keyring_get_key_chunk()
Summary
In the Linux kernel, the following vulnerability has been resolved:
keys: fix out-of-bounds read in keyring_get_key_chunk()
For description-level chunks keyring_get_key_chunk() advances the read
pointer by level * sizeof(long) past the inline prefix but only
bounds-checks the prefix, so a long enough key description is read past
its kmemdup(desc, desc_len + 1) allocation. Compute the full byte
offset and bounds-check the description against it before reading.
The walk only reaches a description-level chunk when two keys collide
through the hash, x, type and domain_tag chunks, so this is reached from
an unprivileged add_key(2) with a crafted pair of same-type keys whose
index hashes collide; KASAN reports a slab-out-of-bounds read.
Severity
7.1 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f771fde82051976a6fc0fd570f8b86de4a92124b , < 4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b
(git)
Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 79916f40d4ab1b4ae694d8c024fd179454bfe46e (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < e5b01998cef8d7f613200230ccaadebe5de9135c (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < d1933e03e8c74a018550c31a393b79c4d95bff40 (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 3a744838453fb9309ce5a5526d3252e211d60152 (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < e9417d21a22ad2ec398e78fcf084b717ce92cf2f (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 8dba33c1e779d0fb9a2acb31e354cf0fc0229111 (git) Affected: f771fde82051976a6fc0fd570f8b86de4a92124b , < 63918731f9ae25b5deb022f118e941e6dddfcef4 (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": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"security/keys/keyring.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "79916f40d4ab1b4ae694d8c024fd179454bfe46e",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "e5b01998cef8d7f613200230ccaadebe5de9135c",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "d1933e03e8c74a018550c31a393b79c4d95bff40",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "3a744838453fb9309ce5a5526d3252e211d60152",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "e9417d21a22ad2ec398e78fcf084b717ce92cf2f",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "8dba33c1e779d0fb9a2acb31e354cf0fc0229111",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "63918731f9ae25b5deb022f118e941e6dddfcef4",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"security/keys/keyring.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"lessThan": "5.3",
"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": "6.6.151",
"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",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.8",
"versionStartIncluding": "5.3",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.3",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: fix out-of-bounds read in keyring_get_key_chunk()\n\nFor description-level chunks keyring_get_key_chunk() advances the read\npointer by level * sizeof(long) past the inline prefix but only\nbounds-checks the prefix, so a long enough key description is read past\nits kmemdup(desc, desc_len + 1) allocation. Compute the full byte\noffset and bounds-check the description against it before reading.\n\nThe walk only reaches a description-level chunk when two keys collide\nthrough the hash, x, type and domain_tag chunks, so this is reached from\nan unprivileged add_key(2) with a crafted pair of same-type keys whose\nindex hashes collide; KASAN reports a slab-out-of-bounds read."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The flaw is reached only through local key-management syscalls (add_key, keyctl link/search) that walk the keyring assoc_array in security/keys/keyring.c; the keys subsystem has no network-facing handler or remote packet path.\nAC:L - An attacker fully controls both key descriptions and can offline-compute a same-type pair whose index collides through hash, x, type and domain_tag yet differs later, deterministically forcing description-level chunks without races or uncontrollable layout.\nPR:L - The fix commit and add_key path confirm any unprivileged local user can add crafted keys to their own session/user keyring (lookup_user_key with KEY_NEED_WRITE); no real-root capability or init-namespace privilege is required.\nUI:N - Exploitation is self-contained: the attacker issues add_key twice with crafted colliding descriptions into a writable keyring they own; no action by another user or administrator is required.\nS:U - The out-of-bounds slab read and any disclosed data remain within the host kernel\u0027s security authority; this is standard local kernel memory access, not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - keyring_get_key_chunk() reads up to a word past the kmemdup(desc,desc_len+1) allocation when the offset includes level*sizeof(long), yielding an adjacent-heap read primitive that can disclose kernel pointers and other sensitive slab contents.\nI:N - This is a read-only out-of-bounds access with no kernel memory write, type confusion, or control-flow hijack; the bug discloses data but does not directly modify kernel or victim integrity.\nA:H - KASAN reports slab-out-of-bounds on trigger, and reading beyond the description allocation can fault at slab/page boundaries; the add_key insertion path is trivially repeatable for denial-of-service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:39:09.169Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b"
},
{
"url": "https://git.kernel.org/stable/c/79916f40d4ab1b4ae694d8c024fd179454bfe46e"
},
{
"url": "https://git.kernel.org/stable/c/e5b01998cef8d7f613200230ccaadebe5de9135c"
},
{
"url": "https://git.kernel.org/stable/c/d1933e03e8c74a018550c31a393b79c4d95bff40"
},
{
"url": "https://git.kernel.org/stable/c/3a744838453fb9309ce5a5526d3252e211d60152"
},
{
"url": "https://git.kernel.org/stable/c/e9417d21a22ad2ec398e78fcf084b717ce92cf2f"
},
{
"url": "https://git.kernel.org/stable/c/8dba33c1e779d0fb9a2acb31e354cf0fc0229111"
},
{
"url": "https://git.kernel.org/stable/c/63918731f9ae25b5deb022f118e941e6dddfcef4"
}
],
"title": "keys: fix out-of-bounds read in keyring_get_key_chunk()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74567",
"datePublished": "2026-08-15T12:28:08.240Z",
"dateReserved": "2026-08-15T05:44:03.917Z",
"dateUpdated": "2026-08-19T16:39:09.169Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-74567",
"date": "2026-09-30",
"epss": "0.00117",
"percentile": "0.01503"
},
"microsoft_vex": {
"current_release_date": "2026-09-25T02:36:39.000Z",
"cve": "CVE-2026-74567",
"id": "msrc_CVE-2026-74567",
"initial_release_date": "2026-08-23T15:04:01.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "keys: fix out-of-bounds read in keyring_get_key_chunk()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74567.json",
"version": "3"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"security/keys/keyring.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "79916f40d4ab1b4ae694d8c024fd179454bfe46e",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "e5b01998cef8d7f613200230ccaadebe5de9135c",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "d1933e03e8c74a018550c31a393b79c4d95bff40",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "3a744838453fb9309ce5a5526d3252e211d60152",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "e9417d21a22ad2ec398e78fcf084b717ce92cf2f",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "8dba33c1e779d0fb9a2acb31e354cf0fc0229111",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
},
{
"lessThan": "63918731f9ae25b5deb022f118e941e6dddfcef4",
"status": "affected",
"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"security/keys/keyring.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"lessThan": "5.3",
"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": "6.6.151",
"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: fix out-of-bounds read in keyring_get_key_chunk()\n\nFor description-level chunks keyring_get_key_chunk() advances the read\npointer by level * sizeof(long) past the inline prefix but only\nbounds-checks the prefix, so a long enough key description is read past\nits kmemdup(desc, desc_len + 1) allocation. Compute the full byte\noffset and bounds-check the description against it before reading.\n\nThe walk only reaches a description-level chunk when two keys collide\nthrough the hash, x, type and domain_tag chunks, so this is reached from\nan unprivileged add_key(2) with a crafted pair of same-type keys whose\nindex hashes collide; KASAN reports a slab-out-of-bounds read."
}
],
"id": "CVE-2026-74567",
"lastModified": "2026-08-19T17:21:11.563",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.2,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-15T13:18:02.227",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3a744838453fb9309ce5a5526d3252e211d60152"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/63918731f9ae25b5deb022f118e941e6dddfcef4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/79916f40d4ab1b4ae694d8c024fd179454bfe46e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8dba33c1e779d0fb9a2acb31e354cf0fc0229111"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d1933e03e8c74a018550c31a393b79c4d95bff40"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e5b01998cef8d7f613200230ccaadebe5de9135c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e9417d21a22ad2ec398e78fcf084b717ce92cf2f"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-21T09:45:21+00:00",
"cve": "CVE-2026-74567",
"id": "CVE-2026-74567",
"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: fix out-of-bounds read in keyring_get_key_chunk()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74567.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-22T16:35:04Z",
"cve": "CVE-2026-74567",
"id": "CVE-2026-74567",
"initial_release_date": "2026-08-15T23:50:01Z",
"product_status:first_fixed": "60",
"product_status:known_affected": "626",
"product_status:known_not_affected": "93",
"product_status:recommended": "107",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-74567",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74567.json",
"version": "12"
}
}
}
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…