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Review reviewHigh

CVE-2022-50300

Linux Linux, linux kernel

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

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.09.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= adfb69af7d8cb6a3958f75aad1ef4bc96891d116 < b8e7ed42bc3ca0d0e4191ee394d34962d3624c22, >= adfb69af7d8cb6a3958f75aad1ef4bc96891d116 < fce3713197ebba239e1c7e02174ed216ea1ee014, >= adfb69af7d8cb6a3958f75aad1ef4bc96891d116 < 169a4cf46882974d4db6d85eb623ec898e51bbc0, >= adfb69af7d8cb6a3958f75aad1ef4bc96891d116 < 1742e1c90c3da344f3bb9b1f1309b3f47482756a, >= 4.15, >= 4.15 < 5.15.87, >= 5.16 < 6.0.18, >= 6.1 < 6.1.4
Fixed versions
5.15.87, 6.0.18, 6.1.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416