Huawei EulerOS: CVE-2024-50199: kernel security update

Huawei EulerOS: CVE-2024-50199: kernel security update

Severity

4

CVSS

(AV:L/AC:M/Au:N/C:P/I:P/A:P)

Published

11/08/2024

Created

01/16/2025

Added

01/15/2025

Modified

01/15/2025

Description

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.

Solution(s)

• huawei-euleros-2_0_sp9-upgrade-kernel
• huawei-euleros-2_0_sp9-upgrade-kernel-tools
• huawei-euleros-2_0_sp9-upgrade-kernel-tools-libs
• huawei-euleros-2_0_sp9-upgrade-python3-perf

References

• https://attackerkb.com/topics/cve-2024-50199
• CVE - 2024-50199
• EulerOS-SA-2025-1057