CVE-2026-98505

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

mm/damon/vaddr: avoid hw-driven pte updates during damon_hugetlb_mkold()

damon_hugetlb_mkold() reads the page table entry into a local variable,

unsets the accessed bit in the variable, and updates the page table entry

with the updated variable value. If hardware updates the same page table

entry in parallel, the hw updates could be lost. For example,

hardware-updated dirty bits might be lost.

Avoid the parallel updates by clearing the page table entry when reading

it together, using huge_ptep_get_and_clear(). If a parallel write to the

memory is made after the clearing, the hw will see the page table entry is

cleared, trigger page fault and wait until it is handled. The page fault

handling will wait for damon_hugetlb_mkold() due to the page table lock.

Because hugetlbfs is an in-memory file system and hugetlb pages cannot be

reclaimed, no critical issue is expected to my best knowledge. But

definitely this is

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References