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Test your applicationsUpgrade RHEL:9
kernel-rt-modules-extra
to version 0:5.14.0-427.35.1.el9_4 or higher.
This issue was patched in RHSA-2024:6567
.
Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules-extra
package and not the kernel-rt-modules-extra
package as distributed by RHEL
.
See How to fix?
for RHEL:9
relevant fixed versions and status.
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.