SB2026040655 - NULL pointer dereference in Linux kernel spi driver
Published: April 6, 2026
Security Bulletin ID
SB2026040655
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-23475)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a NULL-pointer dereference in the spi controller sysfs attributes when handling sysfs attribute access before controller statistics allocation. A remote attacker can access the affected sysfs attributes during this window to cause a denial of service.
The issue occurs because controller per-cpu statistics are not allocated until after the controller has been registered, creating a race window that can crash the kernel.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/118ce777d39f03cac99231196f820e4f998613a8
- https://git.kernel.org/stable/c/378b295f67102eef78cf2c28105f60ae1dab5cc1
- https://git.kernel.org/stable/c/80c5bd0dca1cc5526ae0f4b273ccd163ed4caa4e
- https://git.kernel.org/stable/c/dee0774bbb2abb172e9069ce5ffef579b12b3ae9
- https://git.kernel.org/stable/c/df30056c78e8bead02d4be020199cabdbec0fef1
- https://git.kernel.org/stable/c/f13100b1f5f111989f0750540a795fdef47492af