SB20260918141 - Improper initialization in Linux kernel dax driver
Published: September 18, 2026
Security Bulletin ID
SB20260918141
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper initialization (CVE-ID: CVE-2026-93076)
CWE-ID: CWE-665 - Improper Initialization
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause incorrect vmemmap construction.
The vulnerability exists due to improper initialization of vmemmap_shift in static pgmap handling in fsdev_dax_probe when rebinding a static DAX device from device_dax to fsdev_dax. A local user can rebind a static DAX device to cause incorrect vmemmap construction.
fsdev DAX requires the vmemmap to be built for order-0 folios.
Remediation
Install update from vendor's website.