CVE-2026-98900None▾ SunlitIn 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 gl…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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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.
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 71a0cf87e19fb35c4292ca88985e376e613c900aLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 641de086a05f349de7fc548612432bc2fed721caLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 720554c04acba80018ded069d3e0984bebaee891Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 84d5727cef8eb9c8a28210ad248f1c70b223b065Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 231542f4e43cf9837cb520664545e85fbe666b7bLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2299822f3f466b5dcad2377bf63986199f881a6bLinux < 5.10.271Linux < 5.15.222Linux < 6.1.189Linux < 6.6.158Linux < 6.12.111Linux < 6.18.53Linux (all versions)Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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