SB2026082893 - Incorrect calculation in Linux kernel riscv mm

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect calculation (CVE-ID: CVE-2026-80682)

CWE-ID: CWE-682 - Incorrect Calculation

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 incorrect calculation of address alignment in RISC-V vmemmap_start_pfn handling when initializing sparse memory metadata on systems where the DRAM base is not aligned to the required folio-based boundary. A local user can trigger kernel initialization in a vulnerable environment to cause a denial of service.

The issue was observed as a kernel warning in sparse_init on RISC-V systems such as QEMU virt.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/11ad86830a78ea4e1942afc73c10e4ca8e69e03f
• https://git.kernel.org/stable/c/45ebe4540817cb540a59e4dc04014ac5dddc9990