SB20260925137 - Improper Validation of Specified Quantity in Input in Linux kernel include asm

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Validation of Specified Quantity in Input (CVE-ID: CVE-2026-93237)

CWE-ID: CWE-1284 - Improper Validation of Specified Quantity in Input

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to corrupt page tables and cause a denial of service.

The vulnerability exists due to improper bounds checking in LoongArch physical memory range handling when allocating ZONE_DEVICE regions. A local privileged user can trigger allocation of a ZONE_DEVICE region outside the vmemmap window to corrupt page tables and cause a denial of service.

The issue affects configurations where cpu_pabits is lower than MAX_PHYSMEM_BITS.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2677f97a67fdbc62a82ce1faa67791f54451d36f
• https://git.kernel.org/stable/c/55e18311c705cceef6c34d522ea387b1f0069bab
• https://git.kernel.org/stable/c/ab275a23b4d9f04ca6c2f5f6a3246194e045a761