GHSA-MWRQ-HX54-3H97
Vulnerability from github – Published: 2026-10-23 12:31 – Updated: 2026-10-23 12:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-98900"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-23T12:18:24Z",
"severity": null
},
"details": "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.",
"id": "GHSA-mwrq-hx54-3h97",
"modified": "2026-10-23T12:31:37Z",
"published": "2026-10-23T12:31:37Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98900"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2299822f3f466b5dcad2377bf63986199f881a6b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/231542f4e43cf9837cb520664545e85fbe666b7b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/641de086a05f349de7fc548612432bc2fed721ca"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/71a0cf87e19fb35c4292ca88985e376e613c900a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/720554c04acba80018ded069d3e0984bebaee891"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/84d5727cef8eb9c8a28210ad248f1c70b223b065"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8"
}
],
"schema_version": "1.4.0",
"severity": []
}
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