CVE-2022-50300
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.16%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.16% probability · 6th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/169a4cf46882974d4db6d85eb623ec898e51bbc0Patch
- https://git.kernel.org/stable/c/1742e1c90c3da344f3bb9b1f1309b3f47482756aPatch
- https://git.kernel.org/stable/c/b8e7ed42bc3ca0d0e4191ee394d34962d3624c22Patch
- https://git.kernel.org/stable/c/fce3713197ebba239e1c7e02174ed216ea1ee014Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.