CVE-2026-31590 (GCVE-0-2026-31590)
Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:42
VLAI
EPSS
VEX
Title
KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION
Summary
In the Linux kernel, the following vulnerability has been resolved:
KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION
Drop the WARN in sev_pin_memory() on npages overflowing an int, as the
WARN is comically trivially to trigger from userspace, e.g. by doing:
struct kvm_enc_region range = {
.addr = 0,
.size = -1ul,
};
__vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range);
Note, the checks in sev_mem_enc_register_region() that presumably exist to
verify the incoming address+size are completely worthless, as both "addr"
and "size" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater
than ULONG_MAX. That wart will be cleaned up in the near future.
if (range->addr > ULONG_MAX || range->size > ULONG_MAX)
return -EINVAL;
Opportunistically add a comment to explain why the code calculates the
number of pages the "hard" way, e.g. instead of just shifting @ulen.
Severity
5.5 (Medium)
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < 6a8e3c82122737529b25ef2a048fbcc569d8c055
(git)
Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < a703933bcfa5cc76ca10e2048464600e74136099 (git) Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < abcd43ff579abd0a654bb4636086e78819dd5f4c (git) Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < b670833749ffd8681361db2bb047c6f2e3075f3a (git) Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < ab423e5892826202a660b5ac85d1125b0e8301a5 (git) Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < 28cc13ca20431b127d42d84ba10898d03e2c8267 (git) Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < c29ff288a2d97a6f4640a498a367cf0eb91312eb (git) Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < 1cba4dcd795daf6d257122779fb6a349edf03914 (git) Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < 8acffeef5ef720c35e513e322ab08e32683f32f2 (git) |
guessed | |
| Linux | Linux |
Affected:
5.9
Unaffected: 0 , < 5.9 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0.1 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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{
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"programFiles": [
"arch/x86/kvm/svm/sev.c"
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"versionType": "git"
}
]
},
{
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.136",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.14",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.1",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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}
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION\n\nDrop the WARN in sev_pin_memory() on npages overflowing an int, as the\nWARN is comically trivially to trigger from userspace, e.g. by doing:\n\n struct kvm_enc_region range = {\n .addr = 0,\n .size = -1ul,\n };\n\n __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, \u0026range);\n\nNote, the checks in sev_mem_enc_register_region() that presumably exist to\nverify the incoming address+size are completely worthless, as both \"addr\"\nand \"size\" are u64s and SEV is 64-bit only, i.e. they _can\u0027t_ be greater\nthan ULONG_MAX. That wart will be cleaned up in the near future.\n\n\tif (range-\u003eaddr \u003e ULONG_MAX || range-\u003esize \u003e ULONG_MAX)\n\t\treturn -EINVAL;\n\nOpportunistically add a comment to explain why the code calculates the\nnumber of pages the \"hard\" way, e.g. instead of just shifting @ulen."
}
],
"providerMetadata": {
"dateUpdated": "2026-06-14T17:42:30.901Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/6a8e3c82122737529b25ef2a048fbcc569d8c055"
},
{
"url": "https://git.kernel.org/stable/c/a703933bcfa5cc76ca10e2048464600e74136099"
},
{
"url": "https://git.kernel.org/stable/c/abcd43ff579abd0a654bb4636086e78819dd5f4c"
},
{
"url": "https://git.kernel.org/stable/c/b670833749ffd8681361db2bb047c6f2e3075f3a"
},
{
"url": "https://git.kernel.org/stable/c/ab423e5892826202a660b5ac85d1125b0e8301a5"
},
{
"url": "https://git.kernel.org/stable/c/28cc13ca20431b127d42d84ba10898d03e2c8267"
},
{
"url": "https://git.kernel.org/stable/c/c29ff288a2d97a6f4640a498a367cf0eb91312eb"
},
{
"url": "https://git.kernel.org/stable/c/1cba4dcd795daf6d257122779fb6a349edf03914"
},
{
"url": "https://git.kernel.org/stable/c/8acffeef5ef720c35e513e322ab08e32683f32f2"
}
],
"title": "KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-31590",
"datePublished": "2026-04-24T14:42:17.629Z",
"dateReserved": "2026-03-09T15:48:24.120Z",
"dateUpdated": "2026-06-14T17:42:30.901Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-31590",
"date": "2026-09-14",
"epss": "0.00125",
"percentile": "0.02542"
},
"microsoft_vex": {
"current_release_date": "2026-05-01T14:39:26.000Z",
"cve": "CVE-2026-31590",
"id": "msrc_CVE-2026-31590",
"initial_release_date": "2026-04-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "3",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31590.json",
"version": "5"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-31590\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:36.170\",\"lastModified\":\"2026-06-17T10:34:02.540\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION\\n\\nDrop the WARN in sev_pin_memory() on npages overflowing an int, as the\\nWARN is comically trivially to trigger from userspace, e.g. by doing:\\n\\n struct kvm_enc_region range = {\\n .addr = 0,\\n .size = -1ul,\\n };\\n\\n __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, \u0026range);\\n\\nNote, the checks in sev_mem_enc_register_region() that presumably exist to\\nverify the incoming address+size are completely worthless, as both \\\"addr\\\"\\nand \\\"size\\\" are u64s and SEV is 64-bit only, i.e. they _can\u0027t_ be greater\\nthan ULONG_MAX. That wart will be cleaned up in the near future.\\n\\n\\tif (range-\u003eaddr \u003e ULONG_MAX || range-\u003esize \u003e ULONG_MAX)\\n\\t\\treturn -EINVAL;\\n\\nOpportunistically add a comment to explain why the code calculates the\\nnumber of pages the \\\"hard\\\" way, e.g. instead of just shifting 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T11:55:31+00:00",
"cve": "CVE-2026-31590",
"id": "CVE-2026-31590",
"initial_release_date": "2026-04-24T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31590.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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