CVE-2026-89912
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save MAPC with V=0 drops ite->collection but leaves the ITE on the device's ITT list, and vgic_its_save_ite() dereferences it unconditionally. A guest that issues MAPD, MAPTI and then MAPC(V=0) therefore oopses the host when the VMM issues KVM_DEV_ARM_ITS_SAVE_TABLES to migrate it. That sequence is UNPREDICTABLE per the architecture, but KVM already handles the resulting state in the translate, MOVI and DISCARD paths. Save a zeroed entry, which vgic_its_restore_ite() reads back as invalid. Skipping the ITE instead would leave the ITT slot holding whatever is in guest memory, and restore rejects an entry naming a collection the restored collection table does not have.
Severity
HIGH
CVSS score
7.1
(v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-16 11:17:00.230000
Last modified
2026-10-30 13:20:35.513000
View original CVE JSON
{
"id": "CVE-2026-89912",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-16T11:17:00.230",
"lastModified": "2026-10-30T13:20:35.513",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save\n\nMAPC with V=0 drops ite->collection but leaves the ITE on the device's\nITT list, and vgic_its_save_ite() dereferences it unconditionally. A\nguest that issues MAPD, MAPTI and then MAPC(V=0) therefore oopses the\nhost when the VMM issues KVM_DEV_ARM_ITS_SAVE_TABLES to migrate it.\nThat sequence is UNPREDICTABLE per the architecture, but KVM already\nhandles the resulting state in the translate, MOVI and DISCARD paths.\n\nSave a zeroed entry, which vgic_its_restore_ite() reads back as\ninvalid. Skipping the ITE instead would leave the ITT slot holding\nwhatever is in guest memory, and restore rejects an entry naming a\ncollection the restored collection table does not have."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"arch/arm64/kvm/vgic/vgic-its.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "eff484e0298da5a4d18ca82f5454c557fd942af5",
"lessThan": "df829e4fe235b3a0dbf830986d81c040d3d2e940",
"versionType": "git",
"status": "affected"
},
{
"version": "eff484e0298da5a4d18ca82f5454c557fd942af5",
"lessThan": "0fb71211146e39cf67811ccb873d2770a9c129ac",
"versionType": "git",
"status": "affected"
},
{
"version": "eff484e0298da5a4d18ca82f5454c557fd942af5",
"lessThan": "566d0f99aec92280ce403f22068eb07241a79e2a",
"versionType": "git",
"status": "affected"
},
{
"version": "eff484e0298da5a4d18ca82f5454c557fd942af5",
"lessThan": "dd0c3e6c03e3bb3fd7c0fa422230020674c5c25e",
"versionType": "git",
"status": "affected"
},
{
"version": "eff484e0298da5a4d18ca82f5454c557fd942af5",
"lessThan": "2c3a87ad3d3935c43d465cd2465db9020f9e898f",
"versionType": "git",
"status": "affected"
},
{
"version": "eff484e0298da5a4d18ca82f5454c557fd942af5",
"lessThan": "3d4c26b16a04a084fe0bde08ccdd8086570f8bbe",
"versionType": "git",
"status": "affected"
},
{
"version": "eff484e0298da5a4d18ca82f5454c557fd942af5",
"lessThan": "36df368861d2664291298feeb37dfef43fcae670",
"versionType": "git",
"status": "affected"
},
{
"version": "eff484e0298da5a4d18ca82f5454c557fd942af5",
"lessThan": "c6c156d931c33b92362383cf76f6d6e1291dcbfe",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"arch/arm64/kvm/vgic/vgic-its.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "4.12",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.12",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.10.273",
"lessThanOrEqual": "5.10.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.113",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.51",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.5",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "CHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 2.5,
"impactScore": 4.0
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-10-16T19:26:39.091827Z",
"id": "CVE-2026-89912",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0fb71211146e39cf67811ccb873d2770a9c129ac",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/2c3a87ad3d3935c43d465cd2465db9020f9e898f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/36df368861d2664291298feeb37dfef43fcae670",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/3d4c26b16a04a084fe0bde08ccdd8086570f8bbe",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/566d0f99aec92280ce403f22068eb07241a79e2a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c6c156d931c33b92362383cf76f6d6e1291dcbfe",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/dd0c3e6c03e3bb3fd7c0fa422230020674c5c25e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/df829e4fe235b3a0dbf830986d81c040d3d2e940",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}