CVE-2026-93794
kernel: smb/client: flush dirty data before punching a hole
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 24, 2026
Updated · September 28, 2026
Description
A flaw was found in the Linux kernel's SMB (Server Message Block) client. A local user can cause data corruption when performing hole-punching operations on a mounted SMB share. Because dirty memory pages are not flushed prior to punching a hole, uncommitted cached data can subsequently be written back to the file and refill the punched region. This issue results in data unexpectedly persisting instead of being cleared and deallocated.
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-820 · Missing Synchronization