7.8

CVE-2022-50300

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

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
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.15 < 5.15.87
Linux ≫ Linux Kernel Version >= 5.16 < 6.0.18
Linux ≫ Linux Kernel Version >= 6.1 < 6.1.4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.15% 0.044
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/b8e7ed42bc3ca0d0e4191ee394d34962d3624c22
Patch
https://git.kernel.org/stable/c/fce3713197ebba239e1c7e02174ed216ea1ee014
Patch
https://git.kernel.org/stable/c/169a4cf46882974d4db6d85eb623ec898e51bbc0
Patch
https://git.kernel.org/stable/c/1742e1c90c3da344f3bb9b1f1309b3f47482756a
Patch