CVE-2026-92487
kernel: exfat: fix valid_size extension over a shared writable mapping
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 17, 2026
Updated · October 20, 2026
Description
A flaw was found in the exfat filesystem within the Linux kernel. A race condition can occur when a shared writable memory mapping has its valid_size extended by a buffered write or a page fault. During this process, the kernel zeroes out a page-cache gap, and a concurrent write operation through the mapping can race with this zeroing. This can lead to data being overwritten, potentially resulting in data corruption.
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-366 · Race Condition within a Thread