CVE-2026-98900 (GCVE-0-2026-98900)
Vulnerability from cvelistv5
Published
2026-10-23 11:54
Modified
2026-10-26 06:56
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: dd3140588d9551235ebc2a0dacdca098e7677573 Version: dd3140588d9551235ebc2a0dacdca098e7677573 Version: dd3140588d9551235ebc2a0dacdca098e7677573 Version: dd3140588d9551235ebc2a0dacdca098e7677573 Version: dd3140588d9551235ebc2a0dacdca098e7677573 Version: dd3140588d9551235ebc2a0dacdca098e7677573 Version: dd3140588d9551235ebc2a0dacdca098e7677573 |
||
{
"containers": {
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{
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"programFiles": [
"drivers/xen/gntalloc.c"
],
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{
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],
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"vendor": "Linux",
"versions": [
{
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"version": "2.6.39"
},
{
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"status": "unaffected",
"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"
},
{
"lessThanOrEqual": "6.6.*",
"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",
"vulnerable": true
},
{
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{
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],
"negate": false,
"operator": "OR"
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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",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"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"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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