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CVE-2024-50199

5.5 · MEDIUM

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.

Published Nov 8, 2024EPSS 0.22%

Overview

CVE-2024-50199 is a medium-severity vulnerability. It was published on November 8, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0bRefgit.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebafRefgit.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8dRefgit.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496Refgit.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8Refgit.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7Refgit.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87Reflists.debian.org/debian-lts-announce/2025/01/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/03/msg00002.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-50199?

CVE-2024-50199 is a medium-severity vulnerability. It was published on November 8, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-50199?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-50199?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-50199?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-50199 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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