CVE-2024-50199

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Source
https://cve.org/CVERecord?id=CVE-2024-50199
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-50199.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-50199
Downstream
Related
Published
2024-11-08T05:54:13.403Z
Modified
2026-03-20T12:39:37.477851Z
Summary
mm/swapfile: skip HugeTLB pages for unuse_vma
Details

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 pudclearbad is called by pudnoneorclearbad in unusepudrange() 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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50199.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0fe6e20b9c4c53b3e97096ee73a0857f60aad43f
Fixed
ba7f982cdb37ff5a7739dec85d7325ea66fc1496
Fixed
417d5838ca73c6331ae2fe692fab6c25c00d9a0b
Fixed
e41710f5a61aca9d6baaa8f53908a927dd9e7aa7
Fixed
6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf
Fixed
bed2b9037806c62166a0ef9a559a1e7e3e1275b8
Fixed
eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87
Fixed
7528c4fb1237512ee18049f852f014eba80bbe8d

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-50199.json"