CVE-2026-64106 (GCVE-0-2026-64106)
Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-08-05 12:39
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)
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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"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."
}
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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",
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"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"
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"current_release_date": "2026-09-10T16:47:31Z",
"cve": "CVE-2026-64106",
"id": "CVE-2026-64106",
"initial_release_date": "2026-07-21T12:59:35Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "545",
"product_status:known_not_affected": "33",
"product_status:recommended": "442",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64106",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64106.json",
"version": "18"
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}
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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.
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.
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