xen/gntalloc: validate grant count before allocation

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In the Linux kernel, the following vulnerability has been resolved: xen/gntalloc: validate grant count before allocation gntalloc_ioctl_alloc() allocates the grant-id array before checking whether the requested count fits within the global grant limit. Counts above that limit cannot succeed, so reject them before the user-controlled allocation reaches kcalloc(). Use a subtraction-based check while holding gref_mutex so adding the requested count cannot wrap. Also cast the count before advancing the per-file index so the page-size multiplication is performed in 64-bit arithmetic.

Source published

23 Oct 2026 11:54:10 UTC

Source modified

23 Oct 2026 11:54:10 UTC

Observed here

23 Oct 2026 16:01:20 UTC

Source terms

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