CVE-2026-99111
kernel: smb: client: fix data corruption with concurrent writes and O_TRUNC
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 28, 2026
Updated · October 29, 2026
Description
A flaw was found in the Linux kernel's Server Message Block (SMB) client. Inadequate locking during file truncation allows a local user to perform concurrent write operations while a file is being truncated. This race condition causes newly written data to be discarded silently, 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 · 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CWE-413 · Improper Resource Locking