CVE-2026-98900
xen/gntalloc: validate grant count before allocation
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Oct 23, 2026 |
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Affected Versions
Linux / Linux
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 71a0cf87e19fb35c4292ca88985e376e613c900a 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 641de086a05f349de7fc548612432bc2fed721ca 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 720554c04acba80018ded069d3e0984bebaee891 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 84d5727cef8eb9c8a28210ad248f1c70b223b065 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 231542f4e43cf9837cb520664545e85fbe666b7b 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2299822f3f466b5dcad2377bf63986199f881a6b 0 < 5.10.271 0 < 5.15.222 0 < 6.1.189 0 < 6.6.158 0 < 6.12.111 0 < 6.18.53
Linux / Linux
All versions affected References
git.kernel.org: https://git.kernel.org/stable/c/e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8 git.kernel.org: https://git.kernel.org/stable/c/71a0cf87e19fb35c4292ca88985e376e613c900a git.kernel.org: https://git.kernel.org/stable/c/641de086a05f349de7fc548612432bc2fed721ca git.kernel.org: https://git.kernel.org/stable/c/720554c04acba80018ded069d3e0984bebaee891 git.kernel.org: https://git.kernel.org/stable/c/84d5727cef8eb9c8a28210ad248f1c70b223b065 git.kernel.org: https://git.kernel.org/stable/c/231542f4e43cf9837cb520664545e85fbe666b7b git.kernel.org: https://git.kernel.org/stable/c/2299822f3f466b5dcad2377bf63986199f881a6b