Bug 2395243 (CVE-2022-50300) - CVE-2022-50300 kernel: btrfs: fix extent map use-after-free when handling missing device in read_one_chunk
Summary: CVE-2022-50300 kernel: btrfs: fix extent map use-after-free when handling mis...
Keywords:
Status: NEW
Alias: CVE-2022-50300
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-09-15 15:02 UTC by OSIDB Bzimport
Modified: 2025-09-15 18:06 UTC (History)
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Description OSIDB Bzimport 2025-09-15 15:02:42 UTC 
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
Comment 1 Keith Grant 2025-09-15 18:04:18 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091558-CVE-2022-50300-203c@gregkh/T
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