CVE-2026-45858
kernel: ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 27, 2026
Updated · November 3, 2026
Description
A flaw was found in the Linux kernel's ext4 filesystem. This vulnerability occurs during the splitting of unwritten data blocks, where a portion of the data may be incorrectly marked as written while still containing stale, uninitialized information. A local attacker could potentially exploit this to access sensitive data that should have been zeroed out, leading to information disclosure.
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 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-909 · Missing Initialization of Resource