NULL pointer dereference in Linux kernel - CVE-2026-53344
Published: July 2, 2026
Vulnerability identifier: #VU136704
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-53344
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in the mcp23s08 probe path when initializing regmap during device probe. A local attacker can trigger device probe to cause a denial of service.
The issue occurs because regmap initialization triggers an SPI read to populate the cache before the device and address fields are initialized.
How to mitigate CVE-2026-53344
Install security update from vendor's repository.