Resource exhaustion in Linux kernel - CVE-2026-43338
Published: May 9, 2026
Vulnerability identifier: #VU130848
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43338
CWE-ID: CWE-400
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper resource management in btrfs qgroup ioctls when processing quota group operations. A local user can create many quota groups on a nearly full btrfs filesystem to cause a denial of service.
The issue can trigger a transaction abort with -ENOSPC during delayed reference processing.
How to mitigate CVE-2026-43338
Install security update from vendor's repository.