CVE-2026-45985
kernel: ext4: don't set EXT4_GET_BLOCKS_CONVERT when splitting before submitting I/O
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 27, 2026
Updated · June 28, 2026
Description
A flaw was found in the Linux kernel's ext4 filesystem. When allocating blocks for direct I/O (DIO) and writeback, an incorrect flag handling during extent splitting could lead to a mismatch between the on-disk extent status and the extent status tree. This issue, particularly when a temporary error occurs during extent splitting, could result in the exposure of stale data to a local user if the direct I/O operation fails.
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 · 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition