- Vulnerability/
- CVE-2024-50199
CVE-2024-50199: mm/swapfile: skip HugeTLB pages for unuse_vma
First published: Fri Nov 08 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/417d5838ca73c6331ae2fe692fab6c25c00d9a0b
- https://git.kernel.org/stable/c/6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf
- https://git.kernel.org/stable/c/7528c4fb1237512ee18049f852f014eba80bbe8d
- https://git.kernel.org/stable/c/ba7f982cdb37ff5a7739dec85d7325ea66fc1496
- https://git.kernel.org/stable/c/bed2b9037806c62166a0ef9a559a1e7e3e1275b8
- https://git.kernel.org/stable/c/e41710f5a61aca9d6baaa8f53908a927dd9e7aa7
- https://git.kernel.org/stable/c/eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50199
- https://nvd.nist.gov/vuln/detail/CVE-2024-50199
- https://launchpad.net/bugs/cve/CVE-2024-50199
- https://security-tracker.debian.org/tracker/CVE-2024-50199
- https://ubuntu.com/security/CVE-2024-50199
- https://git.kernel.org/linus/7528c4fb1237512ee18049f852f014eba80bbe8d
Frequently Asked Questions
What is the severity of CVE-2024-50199?
CVE-2024-50199 is classified as a moderate severity vulnerability affecting the Linux kernel.
How do I fix CVE-2024-50199?
To resolve CVE-2024-50199, ensure your system is updated to the latest version of the Linux kernel where the issue has been addressed.
What impact does CVE-2024-50199 have on systems?
CVE-2024-50199 can lead to data loss or corruption when using HugeTLB pages and calling the swapoff command.
Which versions of the Linux kernel are affected by CVE-2024-50199?
CVE-2024-50199 affects versions of the Linux kernel that do not include the fix implemented after the vulnerability was discovered.
Are there any workarounds for CVE-2024-50199?
Currently, the recommended approach for CVE-2024-50199 is to update to the patched version of the Linux kernel, as no specific workarounds have been provided.
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