CVE-2026-98927 (GCVE-0-2026-98927)
Vulnerability from cvelistv5 – Published: 2026-10-23 12:06 – Updated: 2026-10-23 12:06
VLAI
EPSS
VEX
Title
KVM: arm64: nv: Fix life cycle of the nested_mmus array
Summary
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: nv: Fix life cycle of the nested_mmus array
The nested_mmus array holds the shadow page tables that are used when
a guest is running a nested context. These structures are allocated on
VCPU_INIT for whole guest, which implies that they may have to be
relocated as the array grows.
Should a VCPU_INIT occur whilst a vcpu is actively running an L2 and
that the allocation requires relocation, that vcpu will still be
running with a pointer to the previous structure, which will have been
freed.
Fix this by turning the array of structures to an array of pointers,
which is now allocated at VM creation, sized to the absolute maximum
that KVM can handle.
In turn, each VCPU_INIT contributes S2_MMU_PER_VCPU to the pool. No
reallocation is ever performed, and the life cycle of each object is
much clearer:
- the nested_mmus array is allocated in kvm_init_nested(), and freed
in kvm_arch_destroy_vm()
- s2_mmu structures are allocated in kvm_vcpu_init_nested(), and freed
on kvm_arch_flush_shadow_all()
Finally, the freeing of vcpu->arch.vncr_array is made consistent
rather than being done on some failure paths, but not others.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 , < ea242bdc29e8a8ff0e2447a64b3841114779f3af
(git)
Affected: 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 , < 81e3f065a6485626f816d791dfd5e00ddd12eff5 (git) Affected: 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 , < 512c93f4461b9a3735987f48423d438a9cd49e6a (git) Affected: 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 , < 33346f8960c7bb6a3b4e273b5cfe25c5a8be349f (git) |
guessed | |
| Linux | Linux |
Affected:
6.11
Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.9 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/arm64/include/asm/kvm_host.h",
"arch/arm64/include/asm/kvm_nested.h",
"arch/arm64/kvm/arm.c",
"arch/arm64/kvm/nested.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "ea242bdc29e8a8ff0e2447a64b3841114779f3af",
"status": "affected",
"version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
"versionType": "git"
},
{
"lessThan": "81e3f065a6485626f816d791dfd5e00ddd12eff5",
"status": "affected",
"version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
"versionType": "git"
},
{
"lessThan": "512c93f4461b9a3735987f48423d438a9cd49e6a",
"status": "affected",
"version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
"versionType": "git"
},
{
"lessThan": "33346f8960c7bb6a3b4e273b5cfe25c5a8be349f",
"status": "affected",
"version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/arm64/include/asm/kvm_host.h",
"arch/arm64/include/asm/kvm_nested.h",
"arch/arm64/kvm/arm.c",
"arch/arm64/kvm/nested.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"lessThan": "6.11",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.113",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.56",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.9",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "6.11",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Fix life cycle of the nested_mmus array\n\nThe nested_mmus array holds the shadow page tables that are used when\na guest is running a nested context. These structures are allocated on\nVCPU_INIT for whole guest, which implies that they may have to be\nrelocated as the array grows.\n\nShould a VCPU_INIT occur whilst a vcpu is actively running an L2 and\nthat the allocation requires relocation, that vcpu will still be\nrunning with a pointer to the previous structure, which will have been\nfreed.\n\nFix this by turning the array of structures to an array of pointers,\nwhich is now allocated at VM creation, sized to the absolute maximum\nthat KVM can handle.\n\nIn turn, each VCPU_INIT contributes S2_MMU_PER_VCPU to the pool. No\nreallocation is ever performed, and the life cycle of each object is\nmuch clearer:\n\n- the nested_mmus array is allocated in kvm_init_nested(), and freed\n in kvm_arch_destroy_vm()\n\n- s2_mmu structures are allocated in kvm_vcpu_init_nested(), and freed\n on kvm_arch_flush_shadow_all()\n\nFinally, the freeing of vcpu-\u003earch.vncr_array is made consistent\nrather than being done on some failure paths, but not others."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-23T12:06:01.528Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ea242bdc29e8a8ff0e2447a64b3841114779f3af"
},
{
"url": "https://git.kernel.org/stable/c/81e3f065a6485626f816d791dfd5e00ddd12eff5"
},
{
"url": "https://git.kernel.org/stable/c/512c93f4461b9a3735987f48423d438a9cd49e6a"
},
{
"url": "https://git.kernel.org/stable/c/33346f8960c7bb6a3b4e273b5cfe25c5a8be349f"
}
],
"title": "KVM: arm64: nv: Fix life cycle of the nested_mmus array",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-98927",
"datePublished": "2026-10-23T12:06:01.528Z",
"dateReserved": "2026-09-25T10:25:14.380Z",
"dateUpdated": "2026-10-23T12:06:01.528Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"microsoft_vex": {
"current_release_date": "2026-10-24T01:08:07.000Z",
"cve": "CVE-2026-98927",
"id": "msrc_CVE-2026-98927",
"initial_release_date": "2026-10-24T01:08:07.000Z",
"product_status:under_investigation": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "KVM: arm64: nv: Fix life cycle of the nested_mmus array",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98927.json",
"version": "1"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/arm64/include/asm/kvm_host.h",
"arch/arm64/include/asm/kvm_nested.h",
"arch/arm64/kvm/arm.c",
"arch/arm64/kvm/nested.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "ea242bdc29e8a8ff0e2447a64b3841114779f3af",
"status": "affected",
"version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
"versionType": "git"
},
{
"lessThan": "81e3f065a6485626f816d791dfd5e00ddd12eff5",
"status": "affected",
"version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
"versionType": "git"
},
{
"lessThan": "512c93f4461b9a3735987f48423d438a9cd49e6a",
"status": "affected",
"version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
"versionType": "git"
},
{
"lessThan": "33346f8960c7bb6a3b4e273b5cfe25c5a8be349f",
"status": "affected",
"version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/arm64/include/asm/kvm_host.h",
"arch/arm64/include/asm/kvm_nested.h",
"arch/arm64/kvm/arm.c",
"arch/arm64/kvm/nested.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"lessThan": "6.11",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Fix life cycle of the nested_mmus array\n\nThe nested_mmus array holds the shadow page tables that are used when\na guest is running a nested context. These structures are allocated on\nVCPU_INIT for whole guest, which implies that they may have to be\nrelocated as the array grows.\n\nShould a VCPU_INIT occur whilst a vcpu is actively running an L2 and\nthat the allocation requires relocation, that vcpu will still be\nrunning with a pointer to the previous structure, which will have been\nfreed.\n\nFix this by turning the array of structures to an array of pointers,\nwhich is now allocated at VM creation, sized to the absolute maximum\nthat KVM can handle.\n\nIn turn, each VCPU_INIT contributes S2_MMU_PER_VCPU to the pool. No\nreallocation is ever performed, and the life cycle of each object is\nmuch clearer:\n\n- the nested_mmus array is allocated in kvm_init_nested(), and freed\n in kvm_arch_destroy_vm()\n\n- s2_mmu structures are allocated in kvm_vcpu_init_nested(), and freed\n on kvm_arch_flush_shadow_all()\n\nFinally, the freeing of vcpu-\u003earch.vncr_array is made consistent\nrather than being done on some failure paths, but not others."
}
],
"id": "CVE-2026-98927",
"lastModified": "2026-10-23T13:17:13.450",
"metrics": {},
"published": "2026-10-23T13:17:13.450",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/33346f8960c7bb6a3b4e273b5cfe25c5a8be349f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/512c93f4461b9a3735987f48423d438a9cd49e6a"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/81e3f065a6485626f816d791dfd5e00ddd12eff5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ea242bdc29e8a8ff0e2447a64b3841114779f3af"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.