CVE-2021-4149

Description

A vulnerability was found in btrfs_alloc_tree_b in fs/btrfs/extent-tree.c in the Linux kernel due to an improper lock operation in btrfs. In this flaw, a user with a local privilege may cause a denial of service (DOS) due to a deadlock problem.

CVSS Metrics

• v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
• v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.11%• Percentile: 29%

Techniques & Countermeasures

• CWE-667•Improper Locking

  The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Affected Systems

• debian•debian_linux

  9.0

• linux•linux_kernel

  < 5.15 | 5.15 | 5.15:rc1 | 5.15:rc2 | 5.15:rc3 | 5.15:rc4 | 5.15:rc5

References (4)

• https://bugzilla.redhat.com/show_bug.cgi?id=2026485
• https://lkml.org/lkml/2021/10/18/885
• https://lkml.org/lkml/2021/9/13/2565
• https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html