Deadlock in Linux kernel - CVE-2026-74572
Published: August 16, 2026
Vulnerability identifier: #VU143203
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74572
CWE-ID: CWE-833
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper lock management in btree_writepages() and check_bg_is_active() in the btrfs zoned filesystem code when writing metadata extent buffers and committing transactions. A local user can trigger metadata writeback and transaction commit activity to cause a denial of service.
The issue can occur on a zoned btrfs filesystem and may result in a deadlock between metadata writeback and transaction commit.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74572
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1
External References
- https://git.kernel.org/stable/c/18577e77c2c8adaadf1f7c6e9bcd1c0b14e5dcdd
- https://git.kernel.org/stable/c/1ebe51c29fa9755d5b2fea28727c051117907cf8
- https://git.kernel.org/stable/c/75859a7cd77cd2ddaddbcb963e3fcd34738953af
- https://git.kernel.org/stable/c/c3320873e0c04ce7b746fc8fe948f07bbbbdec33
- https://git.kernel.org/stable/c/deddd28fd83c264ee2ff5cd6b34449a9f1be6112