SB2026081290 - NULL pointer dereference in Linux kernel loongarch kernel

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-68435)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/485ed44db5694d8d2e5027f63ad608e705286f30
• https://git.kernel.org/stable/c/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7
• https://git.kernel.org/stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06