CVE-2019-19813

Public on 2021-01-25
Modified on 2021-01-26
Description
In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in __mutex_lock in kernel/locking/mutex.c. This is related to mutex_can_spin_on_owner in kernel/locking/mutex.c, __btrfs_qgroup_free_meta in fs/btrfs/qgroup.c, and btrfs_insert_delayed_items in fs/btrfs/delayed-inode.c.
Severity
Medium
CVSS v3 Base Score
5.5
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 kernel 2021-01-25 23:09 ALAS2-2021-1588
Amazon Linux 1 kernel 2021-01-26 00:11 ALAS-2021-1477

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD CVSSv2 7.1 AV:N/AC:M/Au:N/C:N/I:N/A:C
NVD CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H