CVE-2022-50630High· 7.8▾ TwilightIn 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_userf…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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/[email protected]/ [2] https://lore.kernel.org/linux-mm/[email protected]/
Linux >= 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 < 45c33966759ea1b4040c08dacda99ef623c0ca29Linux >= 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 < 0db2efb3bff879566f05341d94c3de00ac95c4ccLinux >= 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 < dd691973f67b2800a97db723b1ff6f07fdcf7f5aLinux >= 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 < 78504bcedb2f1bbfb353b4d233c24d641c4dda33Linux >= 1a1aad8a9b7bd34f60cdf98cd7915f00ae892c45 < 958f32ce832ba781ac20e11bb2d12a9352ea28fcLinux 4.11Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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