CVE-2024-36000: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix missing hugetlb_lock for resv uncharge There is a recent report on UFFDIO_COPY over hugetlb: https://lore.kernel.org/all/000000000000ee06de0616177560@google.com/ 350: lockdep_assert_held(&hugetlb_lock); Should be an issue in hugetlb but triggered in an userfault context, where it goes into the unlikely path where two threads modifying the resv map together. Mike has a fix in that path for resv uncharge but it looks like the locking criteria was overlooked: hugetlb_cgroup_uncharge_folio_rsvd() will update the cgroup pointer, so it requires to be called with the lock held.

Affected products

• Linux Linux Kernel: from 5.9.7, before 5.10 (fixed in 5.10); from 5.10.1, before 6.1.91 (fixed in 6.1.91); from 6.2, before 6.6.30 (fixed in 6.6.30); from 6.7, before 6.8.9 (fixed in 6.8.9); version 5.10 only; version 6.9 only

Published 2024-05-20. Last modified 2026-06-17.