---
id: CVE-2026-99051
title: 'fsverity: RCU-delay the freeing of struct fsverity_info'
summary: |-
  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 sync…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f77f281b61183a5c0b87e6a4d101c70bd32c1c79 <
    fa84f091a8e7fc46fd29834496fab9739dd4c8dc
  - >-
    Linux >= f77f281b61183a5c0b87e6a4d101c70bd32c1c79 <
    e58c3805ed325fe2d4ae2dd467c0486cc860b733
  - Linux 7.0
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T12:22:30.370Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-99051'
references:
  - url: 'https://git.kernel.org/stable/c/fa84f091a8e7fc46fd29834496fab9739dd4c8dc'
  - url: 'https://git.kernel.org/stable/c/e58c3805ed325fe2d4ae2dd467c0486cc860b733'
tags:
  - cve.org
ingestedAt: '2026-10-23T13:24:55.522Z'
---

## Overview

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.

## Affected

- `Linux >= f77f281b61183a5c0b87e6a4d101c70bd32c1c79 < fa84f091a8e7fc46fd29834496fab9739dd4c8dc`
- `Linux >= f77f281b61183a5c0b87e6a4d101c70bd32c1c79 < e58c3805ed325fe2d4ae2dd467c0486cc860b733`
- `Linux 7.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.