In the Linux kernel, the following vulnerability has been resolved: mm/swapfile: skip HugeTLB pages for unuse_vma I got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The problem can be reproduced by the following steps: 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory. 2. Swapout the above anonymous memory. 3. run swapoff and we will get a bad pud error in kernel message: mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7) We can tell that pud_clear_bad is called by pud_none_or_clear_bad in unuse_pud_range() by ftrace. And therefore the HugeTLB pages will never be freed because we lost it from page table. We can skip HugeTLB pages for unuse_vma to fix it.

ID	Name	Product	Family	Severity
213191	Oracle Linux 8 / 9 : Unbreakable Enterprise kernel (ELSA-2024-12887)	Nessus	Oracle Linux Local Security Checks	critical
213056	Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2024-12884)	Nessus	Oracle Linux Local Security Checks	critical

Detections

Analytics

CVE-2024-50199

medium

Tenable Plugins

critical

critical