CVE-2024-50199 (GCVE-0-2024-50199)

Vulnerability from cvelistv5 – Published: 2024-11-08 05:54 – Updated: 2025-11-03 22:26
VLAI?
Title
mm/swapfile: skip HugeTLB pages for unuse_vma
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < ba7f982cdb37ff5a7739dec85d7325ea66fc1496 (git)
Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < 417d5838ca73c6331ae2fe692fab6c25c00d9a0b (git)
Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < e41710f5a61aca9d6baaa8f53908a927dd9e7aa7 (git)
Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < 6ec0fe3756f941f42f8c57156b8bdf2877b2ebaf (git)
Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < bed2b9037806c62166a0ef9a559a1e7e3e1275b8 (git)
Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < eb66a833cdd2f7302ee05d05e0fa12a2ca32eb87 (git)
Affected: 0fe6e20b9c4c53b3e97096ee73a0857f60aad43f , < 7528c4fb1237512ee18049f852f014eba80bbe8d (git)
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    Linux Linux Affected: 2.6.36
Unaffected: 0 , < 2.6.36 (semver)
Unaffected: 5.4.285 , ≤ 5.4.* (semver)
Unaffected: 5.10.228 , ≤ 5.10.* (semver)
Unaffected: 5.15.169 , ≤ 5.15.* (semver)
Unaffected: 6.1.114 , ≤ 6.1.* (semver)
Unaffected: 6.6.58 , ≤ 6.6.* (semver)
Unaffected: 6.11.5 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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