{"id":"CVE-2026-98900","published":"2026-10-23T12:18:24.020","lastModified":"2026-10-26T07:17:15.340","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxen/gntalloc: validate grant count before allocation\n\ngntalloc_ioctl_alloc() allocates the grant-id array before checking\nwhether the requested count fits within the global grant limit. Counts\nabove that limit cannot succeed, so reject them before the\nuser-controlled allocation reaches kcalloc().\n\nUse a subtraction-based check while holding gref_mutex so adding the\nrequested count cannot wrap. Also cast the count before advancing the\nper-file index so the page-size multiplication is performed in 64-bit\narithmetic.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/2299822f3f466b5dcad2377bf63986199f881a6b","tags":[]},{"url":"https://git.kernel.org/stable/c/231542f4e43cf9837cb520664545e85fbe666b7b","tags":[]},{"url":"https://git.kernel.org/stable/c/641de086a05f349de7fc548612432bc2fed721ca","tags":[]},{"url":"https://git.kernel.org/stable/c/71a0cf87e19fb35c4292ca88985e376e613c900a","tags":[]},{"url":"https://git.kernel.org/stable/c/720554c04acba80018ded069d3e0984bebaee891","tags":[]},{"url":"https://git.kernel.org/stable/c/84d5727cef8eb9c8a28210ad248f1c70b223b065","tags":[]},{"url":"https://git.kernel.org/stable/c/e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}