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CVE-2024-46838

Disclosure Date: September 27, 2024
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Description

In the Linux kernel, the following vulnerability has been resolved:

userfaultfd: don’t BUG_ON() if khugepaged yanks our page table

Since khugepaged was changed to allow retracting page tables in file
mappings without holding the mmap lock, these BUG_ON()s are wrong – get
rid of them.

We could also remove the preceding “if (unlikely(…))” block, but then we
could reach pte_offset_map_lock() with transhuge pages not just for file
mappings but also for anonymous mappings – which would probably be fine
but I think is not necessarily expected.

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General Information

Vendors

  • Linux

Products

  • Linux

Additional Info

Technical Analysis