CVE-2019-19448

moderate-risk
Published 2019-12-08

In the Linux kernel 5.0.21 and 5.3.11, mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in try_merge_free_space in fs/btrfs/free-space-cache.c because the pointer to a left data structure can be the same as the pointer to a right data structure.

Do I need to act?

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0.78% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.8/10 High
LOCAL / LOW complexity

Affected Products (20)

Aff 8300 Firmware
Aff 8700 Firmware

Affected Vendors

Debian Linux Canonical Netapp

References (12)

Exploit https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19448
Mailing List https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
Mailing List https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
Mailing List https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20200103-0001/
Third Party Advisory https://usn.ubuntu.com/4578-1/
Exploit https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19448
Mailing List https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
Mailing List https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
Mailing List https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
Third Party Advisory https://security.netapp.com/advisory/ntap-20200103-0001/
Third Party Advisory https://usn.ubuntu.com/4578-1/
47
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 3/34 · Minimal
Exposure 20/34 · Moderate