Improper Initialization in Linux kernel - CVE-2026-80734
Published: September 4, 2026
Vulnerability identifier: #VU146931
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80734
CWE-ID: CWE-665
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 initialization in Btrfs cached inode mapping flags and minimum folio order when reloading a cached inode after it has been evicted from memory. A local user can trigger the reuse of an evicted cached inode to cause a denial of service.
The issue occurs with an 8K block size and a 4K page size.
Affected software
Linux kernel
How to mitigate CVE-2026-80734
Install security update from vendor's repository.