{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98900",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.379Z",
        "datePublished": "2026-10-23T11:54:10.566Z",
        "dateUpdated": "2026-10-26T06:56:27.943Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-26T06:56:27.943Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/xen/gntalloc.c"
                    ],
                    "versions": [
                        {
                            "version": "dd3140588d9551235ebc2a0dacdca098e7677573",
                            "lessThan": "e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3140588d9551235ebc2a0dacdca098e7677573",
                            "lessThan": "71a0cf87e19fb35c4292ca88985e376e613c900a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3140588d9551235ebc2a0dacdca098e7677573",
                            "lessThan": "641de086a05f349de7fc548612432bc2fed721ca",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3140588d9551235ebc2a0dacdca098e7677573",
                            "lessThan": "720554c04acba80018ded069d3e0984bebaee891",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3140588d9551235ebc2a0dacdca098e7677573",
                            "lessThan": "84d5727cef8eb9c8a28210ad248f1c70b223b065",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3140588d9551235ebc2a0dacdca098e7677573",
                            "lessThan": "231542f4e43cf9837cb520664545e85fbe666b7b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dd3140588d9551235ebc2a0dacdca098e7677573",
                            "lessThan": "2299822f3f466b5dcad2377bf63986199f881a6b",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/xen/gntalloc.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.39",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.39",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.271",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.222",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.111",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.53",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.39",
                                    "versionEndExcluding": "5.10.271"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.39",
                                    "versionEndExcluding": "5.15.222"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.39",
                                    "versionEndExcluding": "6.1.189"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.39",
                                    "versionEndExcluding": "6.6.158"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.39",
                                    "versionEndExcluding": "6.12.111"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.39",
                                    "versionEndExcluding": "6.18.53"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.39",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/71a0cf87e19fb35c4292ca88985e376e613c900a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/641de086a05f349de7fc548612432bc2fed721ca"
                },
                {
                    "url": "https://git.kernel.org/stable/c/720554c04acba80018ded069d3e0984bebaee891"
                },
                {
                    "url": "https://git.kernel.org/stable/c/84d5727cef8eb9c8a28210ad248f1c70b223b065"
                },
                {
                    "url": "https://git.kernel.org/stable/c/231542f4e43cf9837cb520664545e85fbe666b7b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2299822f3f466b5dcad2377bf63986199f881a6b"
                }
            ],
            "title": "xen/gntalloc: validate grant count before allocation",
            "x_generator": {
                "engine": "bippy-1.2.0"
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    }
}