Riskcovery

CVE-2022-50300

btrfs: fix extent map use-after-free when handling missing device in read_one_chunk

State
Published
Severity
7.8 High
Published
Sep 15, 2025
Updated
Aug 5, 2026
Reserved
Sep 15, 2025

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix extent map use-after-free when handling missing device in read_one_chunk

Store the error code before freeing the extent_map. Though it's reference counted structure, in that function it's the first and last allocation so this would lead to a potential use-after-free.

The error can happen eg. when chunk is stored on a missing device and the degraded mount option is missing.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216721

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • adfb69af7d8cb6a3958f75aad1ef4bc96891d116 to before b8e7ed42bc3ca0d0e4191ee394d34962d3624c22Affected
  • adfb69af7d8cb6a3958f75aad1ef4bc96891d116 to before fce3713197ebba239e1c7e02174ed216ea1ee014Affected
  • adfb69af7d8cb6a3958f75aad1ef4bc96891d116 to before 169a4cf46882974d4db6d85eb623ec898e51bbc0Affected
  • adfb69af7d8cb6a3958f75aad1ef4bc96891d116 to before 1742e1c90c3da344f3bb9b1f1309b3f47482756aAffected
LinuxLinux
  • 4.15Affected
  • before 4.15Not affected
  • 5.15.87 through 5.15.*Not affected
  • 6.0.18 through 6.0.*Not affected
  • 6.1.4 through 6.1.*Not affected
  • 6.2 and laterNot affected

References

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