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Vulnerability record · CVE-2019-19448 · published 8 December 2019

CVE-2019-19448: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 2.1% · top 18.6% CWE-416 · Use after free
7.8CVSS 3.1 base score, v2 6.8
2.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
18Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

18 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19448 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20200103-0001/ Third Party Advisory
https://usn.ubuntu.com/4578-1/ Third Party Advisory
https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19448 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20200103-0001/ Third Party Advisory
https://usn.ubuntu.com/4578-1/ Third Party Advisory

Track CVE-2019-19448 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2019-19448), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.