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.
References (6)
Core 6
Core References
Exploit, Third Party Advisory x_refsource_misc
https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19448
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20200103-0001/
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
Third Party Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/4578-1/
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
Scores
CVSS v3
7.8
EPSS
0.0078
EPSS Percentile
73.9%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Details
CWE
CWE-416
Status
published
Products (20)
canonical/ubuntu_linux
14.04
canonical/ubuntu_linux
16.04
canonical/ubuntu_linux
18.04
debian/debian_linux
9.0
linux/linux_kernel
2.6.31 - 4.4.233
netapp/a700s_firmware
netapp/active_iq_unified_manager
netapp/aff_8300_firmware
netapp/aff_8700_firmware
netapp/aff_a400_firmware
... and 10 more
Published
Dec 08, 2019
Tracked Since
Feb 18, 2026