159 lines
8.6 KiB
JSON
159 lines
8.6 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64172",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T07:54:57.039Z",
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"datePublished": "2026-07-19T15:40:57.153Z",
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"dateUpdated": "2026-08-05T12:39:52.348Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:39:52.348Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)\n\nHygon Family 18h CPUs are derived from AMD Family 17h (Zen1) silicon and\nshare the same erratum #1235: hardware may read a stale IsRunning=1 bit\nduring ICR write emulation and silently fail to generate an\nAVIC_IPI_FAILURE_TARGET_NOT_RUNNING VM-Exit on the sending vCPU.\n\nThe absence of the VM-Exit causes KVM to miss the required wakeup of\nblocking target vCPUs, leading to hung vCPUs and unbounded delays in\nguest execution.\n\nExtend the existing AMD Family 17h erratum #1235 workaround to also cover\nHygon Family 18h. With IPI virtualization disabled, KVM never sets\nIsRunning=1 in the Physical ID table, so every non-self IPI generates a\nVM-Exit and is correctly emulated."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Exploitation requires executing guest code that issues APIC ICR writes against blocking vCPUs; the vulnerable KVM/AVIC path is reached from within a VM, not from remote network packets to the host.\nAC:L - The erratum is a race on IsRunning that the attacker fully controls by pinning one vCPU in a blocking halt/mwait state and having another vCPU send timed IPIs; no conditions outside attacker influence are required once AVIC is active.\nPR:N - No host privileges are needed beyond the ability to run code in a tenant VM on a Hygon KVM host; a cloud customer with a standard VM instance can trigger the bug without host root or special capabilities.\nUI:N - No victim interaction is required; a malicious guest can autonomously orchestrate blocking and IPI traffic to hang vCPUs.\nS:C - In nested virtualization deployments, a malicious L1 hypervisor guest can cause hung vCPUs and unbounded execution delays in L2 guests via the host KVM AVIC path, crossing the L1/L2 security boundary even though there is no host escape.\nC:N - The bug is a missed VM-exit and missed vCPU wakeup with no out-of-bounds access, use-after-free, or information disclosure primitive.\nI:N - No memory or data structures are corrupted; the failure only prevents delivery of required wake events to blocking vCPUs.\nA:H - Missed wakeups cause hung vCPUs and unbounded delays in guest execution, constituting a reliable denial-of-service against VM availability."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/x86/kvm/svm/avic.c"
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],
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"versions": [
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{
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"version": "8de4a1c8164e5b2e40d1df764840a31de983f40b",
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"lessThan": "94ade38f317ea086a181db0e6b69c574b3b70a5e",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8de4a1c8164e5b2e40d1df764840a31de983f40b",
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"lessThan": "9560e6fee887a9594a89fa265b5b9c79b1591803",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8de4a1c8164e5b2e40d1df764840a31de983f40b",
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"lessThan": "9a12fa5213cfc391e0eed63902d3be98f0913765",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/x86/kvm/svm/avic.c"
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],
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"versions": [
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{
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"version": "6.17",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.17",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "6.18.34"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "7.0.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/94ade38f317ea086a181db0e6b69c574b3b70a5e"
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},
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{
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"url": "https://git.kernel.org/stable/c/9560e6fee887a9594a89fa265b5b9c79b1591803"
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},
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{
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"url": "https://git.kernel.org/stable/c/9a12fa5213cfc391e0eed63902d3be98f0913765"
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}
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],
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"title": "KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)",
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"x_generator": {
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