CVE-2025-39759
kernel: Linux kernel (btrfs): Use-after-free in qgroup due to race condition
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 11, 2025
Updated · June 30, 2026
Description
A flaw was found in the Linux kernel's btrfs filesystem, specifically within its qgroup feature. A local user could exploit a race condition between disabling quotas and performing a quota rescan operation. This could lead to a use-after-free vulnerability, potentially resulting in a denial of service (DoS) on the system.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition