Incorrect calculation in Linux kernel - CVE-2026-80682

Vulnerability details

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.

Affected software

How to mitigate CVE-2026-80682

External References

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

Related Security Bulletins

• Incorrect calculation in Linux kernel riscv mm