NULL pointer dereference in Linux kernel - CVE-2026-68435
Published: August 12, 2026
Vulnerability identifier: #VU141608
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2026-68435
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper handling of user-space pointers in machine_kexec_prepare() in arch/loongarch/kernel/machine_kexec.c when searching loaded kexec segments for the command line marker on the kexec_load(2) path. A local user can provide a crafted user-space segment buffer to trigger a kernel dereference of a user pointer and cause a denial of service.
The issue affects the LoongArch kexec_load(2) path with file_mode set to 0.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-68435
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.115-2
linux (Debian package) - update to 6.12.115-2