CVE-2026-31575

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description In the mfill atomic hugetlb() function, the linear page index() function is used to calculate the page index for hugetlb fault mutex hash(). Because linear page index() returns the index in PAGE SIZE units while hugetlb fault mutex hash() expects the index in huge page units, different addresses within the same huge page can produce different hash values. This leads to the use of different mutexes for the same huge page, causing races between faulting threads that can corrupt the reservation map and trigger a BUG ON in resv map release().

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.