SB20260406101 - Race condition in Linux kernel nand raw driver
Published: April 6, 2026
Security Bulletin ID
SB20260406101
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) Race condition (CVE-ID: CVE-2026-23434)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in nand_lock() and nand_unlock() when serializing lock and unlock operations against other NAND operations. A local user can trigger concurrent NAND operations to cause a denial of service.
The issue occurs because chip->ops.lock_area and unlock_area are called without holding the NAND device lock, which can result in cmd_pending conflicts on the NAND controller during concurrent UBI/UBIFS background erase or write operations.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/5fd5c078af23cb353507aa522e09d557d7eaef04
- https://git.kernel.org/stable/c/a80291e577b44593a724d6cd64c14337c78f194d
- https://git.kernel.org/stable/c/bab2bc6e850a697a23b9e5f0e21bb8c187615e95
- https://git.kernel.org/stable/c/ce5229e78078e437704157eb542f43a6f83b429b
- https://git.kernel.org/stable/c/f25446e2c28939753d3b62d34dfda49952b2557d
- https://git.kernel.org/stable/c/f71ce0ae5aefe39dd5b2f996c0e08550d2153ad2