Description (CNA)
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/
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 before 45c33966759ea1b4040c08dacda99ef623c0ca29; affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 before 0db2efb3bff879566f05341d94c3de00ac95c4cc; affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 before dd691973f67b2800a97db723b1ff6f07fdcf7f5a; affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 before 78504bcedb2f1bbfb353b4d233c24d641c4dda33; affected 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 before 958f32ce832ba781ac20e11bb2d12a9352ea28fc |
| Linux / Linux | affected 4.11; unaffected 0 before 4.11; unaffected 5.10.150 through 5.10.*; unaffected 5.15.75 through 5.15.*; unaffected 5.19.17 through 5.19.*; unaffected 6.0.3 through 6.0.*; unaffected 6.1 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
No references supplied.