CVE-2026-64106 (GCVE-0-2026-64106)
Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-10-19 20:28
VLAI
EPSS
VEX
Title
KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits
Summary
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits
Userspace can restore an ITS Device Table Entry whose Size field encodes
more EventID bits than the virtual ITS supports. The live MAPD path
rejects that state, but vgic_its_restore_dte() accepts it and stores the
out-of-range value in dev->num_eventid_bits.
Reject restored DTEs with num_eventid_bits > VITS_TYPER_IDBITS before
allocating the device. This mirrors the MAPD check and prevents the
restored state from reaching vgic_its_restore_itt(), where the unchecked
value can be converted into an oversized scan_its_table() range.
Severity
9 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:36 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
57a9a117154c93539e33161dd318e6aeb8c04efa , < 1716b7fea2ead941a0dfac06c4504a3437cdf00d
(git)
Affected: 57a9a117154c93539e33161dd318e6aeb8c04efa , < dab9f93251b2c86a033de6098d0c73afddd55d4a (git) Affected: 57a9a117154c93539e33161dd318e6aeb8c04efa , < b94538186a3eae3763b8f96dacd610920a865aa7 (git) Affected: 57a9a117154c93539e33161dd318e6aeb8c04efa , < 0680f511926589206f81f57f76ce131d7741a316 (git) Affected: 57a9a117154c93539e33161dd318e6aeb8c04efa , < 8bcd15b690a390241179516af1b6ae49ebfd9d95 (git) Affected: 57a9a117154c93539e33161dd318e6aeb8c04efa , < 9ce754ed8e7ab4e3999767ce1505f85c449ccb07 (git) |
guessed | |
| Linux | Linux |
Affected:
4.12
Unaffected: 0 , < 4.12 (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"cve": "CVE-2026-64106",
"id": "CVE-2026-64106",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64106.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-64106",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:36:21.559565Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "CWE-20 Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-16T15:36:22.133Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/arm64/kvm/vgic/vgic-its.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "1716b7fea2ead941a0dfac06c4504a3437cdf00d",
"status": "affected",
"version": "57a9a117154c93539e33161dd318e6aeb8c04efa",
"versionType": "git"
},
{
"lessThan": "dab9f93251b2c86a033de6098d0c73afddd55d4a",
"status": "affected",
"version": "57a9a117154c93539e33161dd318e6aeb8c04efa",
"versionType": "git"
},
{
"lessThan": "b94538186a3eae3763b8f96dacd610920a865aa7",
"status": "affected",
"version": "57a9a117154c93539e33161dd318e6aeb8c04efa",
"versionType": "git"
},
{
"lessThan": "0680f511926589206f81f57f76ce131d7741a316",
"status": "affected",
"version": "57a9a117154c93539e33161dd318e6aeb8c04efa",
"versionType": "git"
},
{
"lessThan": "8bcd15b690a390241179516af1b6ae49ebfd9d95",
"status": "affected",
"version": "57a9a117154c93539e33161dd318e6aeb8c04efa",
"versionType": "git"
},
{
"lessThan": "9ce754ed8e7ab4e3999767ce1505f85c449ccb07",
"status": "affected",
"version": "57a9a117154c93539e33161dd318e6aeb8c04efa",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/arm64/kvm/vgic/vgic-its.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.12"
},
{
"lessThan": "4.12",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.175",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.142",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.92",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.34",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.11",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1",
"versionStartIncluding": "4.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits\n\nUserspace can restore an ITS Device Table Entry whose Size field encodes\nmore EventID bits than the virtual ITS supports. The live MAPD path\nrejects that state, but vgic_its_restore_dte() accepts it and stores the\nout-of-range value in dev-\u003enum_eventid_bits.\n\nReject restored DTEs with num_eventid_bits \u003e VITS_TYPER_IDBITS before\nallocating the device. This mirrors the MAPD check and prevents the\nrestored state from reaching vgic_its_restore_itt(), where the unchecked\nvalue can be converted into an oversized scan_its_table() range."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached only through the KVM device ioctl path (KVM_SET_DEVICE_ATTR with KVM_DEV_ARM_ITS_RESTORE_TABLES), which requires a local process with access to a VM file descriptor; it is not triggered by network packets or guest MMIO/ITS commands.\nAC:L - An attacker can reliably plant a crafted Device Table Entry in guest RAM (Size field encoding 17\u201332 EventID bits) and have it processed during migration/snapshot restore; no race or attacker-uncontrollable memory layout is required, and the live MAPD path already proves the invalid state is straightforward to supply.\nPR:N - The highest-impact scenario is a malicious cloud VM tenant who needs no host privileges: they write a malformed DTE directly into guest physical memory (bypassing MAPD validation) and trigger host-side restore during automated live migration or snapshot resume, without requiring /dev/kvm or root on the host.\nUI:N - Exploitation does not require victim interaction beyond normal hypervisor operations such as automated live migration or snapshot restore that the attacker can initiate as a VM tenant; no end-user action like opening a file is needed.\nS:C - The vulnerability crosses the VM security boundary because guest-controlled saved state causes the host kernel to perform an oversized ITS table scan and mass kernel allocations, impacting host availability outside the guest\u0027s security scope.\nC:H - The unchecked num_eventid_bits value inflates scan_its_table()\u0027s range up to BIT_ULL(32)*8 bytes (and can wrap the int size parameter for values 28\u201331), causing the host kernel to read far beyond the valid ITT bounds through kvm_read_guest_lock across a large guest GPA span.\nI:N - The flaw causes excessive guest-memory reads and kernel object allocation but does not corrupt or write host kernel memory; there is no demonstrated arbitrary host write, use-after-free, or code-execution primitive from this bug alone.\nA:H - The oversized scan can loop for an enormous number of kvm_read_guest_lock iterations (worse when the truncated int size wraps to a huge unsigned length), and valid-looking restored ITEs can drive unbounded vgic_add_lpi/kzalloc allocations, exhausting host CPU and memory and causing severe denial of service."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:39:16.848Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1716b7fea2ead941a0dfac06c4504a3437cdf00d"
},
{
"url": "https://git.kernel.org/stable/c/dab9f93251b2c86a033de6098d0c73afddd55d4a"
},
{
"url": "https://git.kernel.org/stable/c/b94538186a3eae3763b8f96dacd610920a865aa7"
},
{
"url": "https://git.kernel.org/stable/c/0680f511926589206f81f57f76ce131d7741a316"
},
{
"url": "https://git.kernel.org/stable/c/8bcd15b690a390241179516af1b6ae49ebfd9d95"
},
{
"url": "https://git.kernel.org/stable/c/9ce754ed8e7ab4e3999767ce1505f85c449ccb07"
}
],
"title": "KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64106",
"datePublished": "2026-07-19T15:40:09.344Z",
"dateReserved": "2026-07-19T07:54:57.034Z",
"dateUpdated": "2026-10-19T20:28:12.062Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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
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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.
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.
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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.