CVE-2022-50630mm: hugetlb: fix UAF in hugetlb_handle_userfault
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: mm: hugetlb: fix UAF in hugetlb_handle_userfault The vma_lock and hugetlb_fault_mutex are dropped before handling userfault and reacquire them again after handle_userfault(), but reacquire the vma_lock could lead to UAF[1,2] due to the following race, hugetlb_fault hugetlb_no_page /*unlock vma_lock */ hugetlb_handle_userfault handle_userfault /* unlock mm->mmap_lock*/ vm_mmap_pgoff do_mmap mmap_region munmap_vma_range /* clean old vma */ /* lock vma_lock again <--- UAF */ /* unlock vma_lock */ Since the vma_lock will unlock immediately after hugetlb_handle_userfault(), let's drop the unneeded lock and unlock in hugetlb_handle_userfault() to fix the issue. [1] https://lore.kernel.org/linux-mm/000000000000d5e00a05e834962e@google.com/ [2] https://lore.kernel.org/linux-mm/20220921014457.1668-1-liuzixian4@huawei.com/
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 before 45c33966759ea1b4040c08dacda99ef623c0ca29; 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 builds before 0db2efb3bff879566f05341d94c3de00ac95c4cc; from 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 before dd691973f67b2800a97db723b1ff6f07fdcf7f5a; from 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 before 78504bcedb2f1bbfb353b4d233c24d641c4dda33; from 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 before 958f32ce832ba781ac20e11bb2d12a9352ea28fc | CNA record |
References
- https://git.kernel.org/stable/c/45c33966759ea1b4040c08dacda99ef623c0ca29
- https://git.kernel.org/stable/c/0db2efb3bff879566f05341d94c3de00ac95c4cc
- https://git.kernel.org/stable/c/dd691973f67b2800a97db723b1ff6f07fdcf7f5a
- https://git.kernel.org/stable/c/78504bcedb2f1bbfb353b4d233c24d641c4dda33
- https://git.kernel.org/stable/c/958f32ce832ba781ac20e11bb2d12a9352ea28fc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.