SB2026050971 - Improper locking in Linux kernel spi driver
Published: May 9, 2026
Security Bulletin ID
SB2026050971
CSH 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 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-43319)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper lock management in the spidev driver when handling concurrent write and ioctl operations on the same spidev file descriptor. A local user can perform write() and SPI_IOC_WR_MAX_SPEED_HZ ioctl() calls from separate threads to cause a denial of service.
The issue is triggered by an AB-BA locking pattern involving spi_lock and buf_lock.
Remediation
Install update from vendor's website.