NULL pointer dereference in Linux kernel - CVE-2026-64511
Published: July 27, 2026
Vulnerability identifier: #VU139420
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64511
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an attacker with physical access to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in acpi_nfit_uc_error_notify() in the ACPI NFIT core when handling an NFIT_NOTIFY_UC_MEMORY_ERROR notification for an NFIT device without initialized driver data. An attacker with physical access can trigger a firmware notification to cause a denial of service.
The issue occurs when the notify handler is installed before the presence of the NFIT table is verified.
Affected software
Linux kernel
How to mitigate CVE-2026-64511
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/027e128abb82788189d6d45b68e3e8e7329b67be
- https://git.kernel.org/stable/c/3c8f73b0fbdf956c98e2329d5aaea3ad09a9cfb6
- https://git.kernel.org/stable/c/452945662fd8e9862a2d2043239c7ee1815d1ac4
- https://git.kernel.org/stable/c/873576e585da5d0fc5debbab74eed565c0acea99
- https://git.kernel.org/stable/c/a44343fe230aa48c74ef09830f3c5c90848b257e