CVE-2019-19813

moderate-risk
Published 2019-12-17

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.

Do I need to act?

~
1.2% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (15)

Aff A700S Firmware
Fas8300 Firmware
Fas8700 Firmware

Affected Vendors

Debian Linux Canonical Netapp

References (10)

Exploit https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19813
Mailing List https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
Mailing List https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20200103-0001/
Third Party Advisory https://usn.ubuntu.com/4414-1/
Exploit https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19813
Mailing List https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
Mailing List https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20200103-0001/
Third Party Advisory https://usn.ubuntu.com/4414-1/
40
/ 100
moderate-risk
Severity 18/34 · Moderate
Exploitability 4/34 · Minimal
Exposure 18/34 · Moderate