298 lines
15 KiB
JSON
298 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-74567",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-15T05:44:03.917Z",
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"datePublished": "2026-08-15T12:28:08.240Z",
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"dateUpdated": "2026-10-16T19:05:56.377Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-19T16:39:09.169Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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's 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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"security/keys/keyring.c"
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],
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"versions": [
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{
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"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
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"lessThan": "4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
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"lessThan": "79916f40d4ab1b4ae694d8c024fd179454bfe46e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
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"lessThan": "e5b01998cef8d7f613200230ccaadebe5de9135c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
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"lessThan": "d1933e03e8c74a018550c31a393b79c4d95bff40",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
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"lessThan": "3a744838453fb9309ce5a5526d3252e211d60152",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
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"lessThan": "e9417d21a22ad2ec398e78fcf084b717ce92cf2f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
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"lessThan": "8dba33c1e779d0fb9a2acb31e354cf0fc0229111",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
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"lessThan": "63918731f9ae25b5deb022f118e941e6dddfcef4",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"security/keys/keyring.c"
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],
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"versions": [
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{
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"version": "5.3",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.3",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.265",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.216",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.183",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.151",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.103",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.44",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.8",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.3",
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"versionEndExcluding": "5.10.265"
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},
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b"
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},
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{
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"url": "https://git.kernel.org/stable/c/79916f40d4ab1b4ae694d8c024fd179454bfe46e"
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},
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{
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"url": "https://git.kernel.org/stable/c/e5b01998cef8d7f613200230ccaadebe5de9135c"
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},
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{
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"url": "https://git.kernel.org/stable/c/d1933e03e8c74a018550c31a393b79c4d95bff40"
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},
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{
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"url": "https://git.kernel.org/stable/c/3a744838453fb9309ce5a5526d3252e211d60152"
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},
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{
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"url": "https://git.kernel.org/stable/c/e9417d21a22ad2ec398e78fcf084b717ce92cf2f"
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},
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{
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"url": "https://git.kernel.org/stable/c/8dba33c1e779d0fb9a2acb31e354cf0fc0229111"
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},
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{
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"url": "https://git.kernel.org/stable/c/63918731f9ae25b5deb022f118e941e6dddfcef4"
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}
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],
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"title": "keys: fix out-of-bounds read in keyring_get_key_chunk()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74567",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:00:22.634859Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:05:56.377Z"
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}
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}
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]
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}
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} |