{"id":"CVE-2026-74567","title":"keys: fix out-of-bounds read in keyring_get_key_chunk()","summary":"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…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b","Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 79916f40d4ab1b4ae694d8c024fd179454bfe46e","Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < e5b01998cef8d7f613200230ccaadebe5de9135c","Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < d1933e03e8c74a018550c31a393b79c4d95bff40","Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 3a744838453fb9309ce5a5526d3252e211d60152","Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < e9417d21a22ad2ec398e78fcf084b717ce92cf2f","Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 8dba33c1e779d0fb9a2acb31e354cf0fc0229111","Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 63918731f9ae25b5deb022f118e941e6dddfcef4","Linux 5.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T19:00:22.634859Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:56.377Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74567","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"}],"tags":["cve.org"],"epss":0.00117,"epssPercentile":0.01552,"ingestedAt":"2026-10-16T19:46:24.343Z","slug":"CVE-2026-74567","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b`\n- `Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 79916f40d4ab1b4ae694d8c024fd179454bfe46e`\n- `Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < e5b01998cef8d7f613200230ccaadebe5de9135c`\n- `Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < d1933e03e8c74a018550c31a393b79c4d95bff40`\n- `Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 3a744838453fb9309ce5a5526d3252e211d60152`\n- `Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < e9417d21a22ad2ec398e78fcf084b717ce92cf2f`\n- `Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 8dba33c1e779d0fb9a2acb31e354cf0fc0229111`\n- `Linux >= f771fde82051976a6fc0fd570f8b86de4a92124b < 63918731f9ae25b5deb022f118e941e6dddfcef4`\n- `Linux 5.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}