{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74567","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.917Z","datePublished":"2026-08-15T12:28:08.240Z","dateUpdated":"2026-08-19T16:39:09.169Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-19T16:39:09.169Z"},"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":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"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'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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/keys/keyring.c"],"versions":[{"version":"f771fde82051976a6fc0fd570f8b86de4a92124b","lessThan":"4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b","status":"affected","versionType":"git"},{"version":"f771fde82051976a6fc0fd570f8b86de4a92124b","lessThan":"79916f40d4ab1b4ae694d8c024fd179454bfe46e","status":"affected","versionType":"git"},{"version":"f771fde82051976a6fc0fd570f8b86de4a92124b","lessThan":"e5b01998cef8d7f613200230ccaadebe5de9135c","status":"affected","versionType":"git"},{"version":"f771fde82051976a6fc0fd570f8b86de4a92124b","lessThan":"d1933e03e8c74a018550c31a393b79c4d95bff40","status":"affected","versionType":"git"},{"version":"f771fde82051976a6fc0fd570f8b86de4a92124b","lessThan":"3a744838453fb9309ce5a5526d3252e211d60152","status":"affected","versionType":"git"},{"version":"f771fde82051976a6fc0fd570f8b86de4a92124b","lessThan":"e9417d21a22ad2ec398e78fcf084b717ce92cf2f","status":"affected","versionType":"git"},{"version":"f771fde82051976a6fc0fd570f8b86de4a92124b","lessThan":"8dba33c1e779d0fb9a2acb31e354cf0fc0229111","status":"affected","versionType":"git"},{"version":"f771fde82051976a6fc0fd570f8b86de4a92124b","lessThan":"63918731f9ae25b5deb022f118e941e6dddfcef4","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["security/keys/keyring.c"],"versions":[{"version":"5.3","status":"affected"},{"version":"0","lessThan":"5.3","status":"unaffected","versionType":"semver"},{"version":"5.10.265","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.151","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.103","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.44","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.8","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"7.2"}]}]}],"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"}}}}