CVE-2026-98900 (GCVE-0-2026-98900)
Vulnerability from cvelistv5 – Published: 2026-10-23 11:54 – Updated: 2026-10-26 06:56
VLAI
EPSS
VEX
Title
xen/gntalloc: validate grant count before allocation
Summary
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.
Severity
No CVSS data available.
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
dd3140588d9551235ebc2a0dacdca098e7677573 , < e2806390aa1c4d5b3f7a68f10a56ae12c71c00d8
(git)
Affected: dd3140588d9551235ebc2a0dacdca098e7677573 , < 71a0cf87e19fb35c4292ca88985e376e613c900a (git) Affected: dd3140588d9551235ebc2a0dacdca098e7677573 , < 641de086a05f349de7fc548612432bc2fed721ca (git) Affected: dd3140588d9551235ebc2a0dacdca098e7677573 , < 720554c04acba80018ded069d3e0984bebaee891 (git) Affected: dd3140588d9551235ebc2a0dacdca098e7677573 , < 84d5727cef8eb9c8a28210ad248f1c70b223b065 (git) Affected: dd3140588d9551235ebc2a0dacdca098e7677573 , < 231542f4e43cf9837cb520664545e85fbe666b7b (git) Affected: dd3140588d9551235ebc2a0dacdca098e7677573 , < 2299822f3f466b5dcad2377bf63986199f881a6b (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.39
Unaffected: 0 , < 2.6.39 (semver) Unaffected: 5.10.271 , ≤ 5.10.* (semver) Unaffected: 5.15.222 , ≤ 5.15.* (semver) Unaffected: 6.1.189 , ≤ 6.1.* (semver) Unaffected: 6.6.158 , ≤ 6.6.* (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
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"programFiles": [
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},
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"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "2.6.39"
},
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"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.271",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"versionStartIncluding": "2.6.39",
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},
{
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},
{
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],
"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-26T06:56:27.943Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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",
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"cveId": "CVE-2026-98900",
"datePublished": "2026-10-23T11:54:10.566Z",
"dateReserved": "2026-09-25T10:25:14.379Z",
"dateUpdated": "2026-10-26T06:56:27.943Z",
"state": "PUBLISHED"
},
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"date": "2026-10-26",
"epss": "0.00179",
"percentile": "0.07395"
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"id": "msrc_CVE-2026-98900",
"initial_release_date": "2026-10-24T01:04:58.000Z",
"product_status:fixed": "1",
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"title": "xen/gntalloc: validate grant count before allocation",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98900.json",
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{
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"versionType": "semver"
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{
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"version": "6.18.53",
"versionType": "semver"
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{
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"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."
}
],
"id": "CVE-2026-98900",
"lastModified": "2026-10-26T07:17:15.340",
"metrics": {},
"published": "2026-10-23T12:18:24.020",
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
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},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-10-26T17:03:19+00:00",
"cve": "CVE-2026-98900",
"id": "CVE-2026-98900",
"initial_release_date": "2026-10-23T00:00:00+00:00",
"product_status:known_not_affected": "278",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: xen/gntalloc: validate grant count before allocation",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98900.json",
"version": "3"
}
}
}
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| Author | Source | Type | Date | Other |
|---|
Nomenclature
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