CVE-2026-74516 (GCVE-0-2026-74516)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:38
VLAI
Title
KVM: SVM: Update x2APIC MSR intercepts if AVIC is inhibited while L2 is active
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Update x2APIC MSR intercepts if AVIC is inhibited while L2 is active Always update x2APIC MSR intercepts for L1 when AVIC is deactivated, even if L2 is active and KVM is using a separate MSR bitmap to run L2. If AVIC is fully enabled prior to running L2, and is then inhibited while L2 is active (for a VM-scoped inhibit), then KVM will run L1 with AVIC disabled, but with x2APIC MSR intercepts disabled, i.e. will allow L1 to read most of the host's APIC state, send arbitrary interrupts, change task priority, and ultimately trivially DoS the host. E.g. sending a self-IPI in L1 on HYPERV_REENLIGHTENMENT_VECTOR, 0xee, with CONFIG_HYPERV=n in the host kernel as a "safe" PoC, yields: Spurious interrupt (vector 0xee) on CPU#425. Acked And hacking KVM to abuse kvm_set_posted_intr_wakeup_handler() to register a handler and WARN on POSTED_INTR_WAKEUP_VECTOR yields: ------------[ cut here ]------------ WARNING: arch/x86/kvm/svm/svm.c:5594 at pi_wakeup_handler+0x9/0x10 [kvm_amd], CPU#156: nested_x2apic_t/316940 CPU: 156 UID: 0 PID: 316940 Comm: nested_x2apic_t Tainted: G S U Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER Hardware name: Google Astoria-Turin/astoria, BIOS 0.20260209.0-0 02/09/2026 RIP: 0010:pi_wakeup_handler+0x9/0x10 [kvm_amd] Call Trace: <IRQ> sysvec_kvm_posted_intr_wakeup_ipi+0x64/0x80 </IRQ> <TASK> asm_sysvec_kvm_posted_intr_wakeup_ipi+0x1a/0x20 RIP: 0010:vcpu_run+0x1430/0x1e40 [kvm] kvm_arch_vcpu_ioctl_run+0x2c1/0x600 [kvm] kvm_vcpu_ioctl+0x580/0x6b0 [kvm] __se_sys_ioctl+0x6d/0xb0 do_syscall_64+0x10a/0x480 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x46ff4b </TASK> ---[ end trace 0000000000000000 ]---
Severity
8.2 (High)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 091abbf578f926e763adc0f577baeb7f405b4bdc , < 4ca05385b3ddbd463be17c6d69ec76fca657081d (git)
Affected: 091abbf578f926e763adc0f577baeb7f405b4bdc , < 6664a5aea45318f4ec156a729949b474dd6e3159 (git)
Affected: 091abbf578f926e763adc0f577baeb7f405b4bdc , < f12373625b4dc9bcc89c41872648878c73bb9272 (git)
Affected: 091abbf578f926e763adc0f577baeb7f405b4bdc , < 7668c58dcf465559dc7a0d2e95e9cb79cf47454b (git)
Affected: 091abbf578f926e763adc0f577baeb7f405b4bdc , < 89f9e8398e79c49886766fc24a84c37726231104 (git)
Affected: 091abbf578f926e763adc0f577baeb7f405b4bdc , < 7d3aae206663c4e006b25a1c7a20a4029e67da76 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Update x2APIC MSR intercepts if AVIC is inhibited while L2 is active\n\nAlways update x2APIC MSR intercepts for L1 when AVIC is deactivated, even\nif L2 is active and KVM is using a separate MSR bitmap to run L2.  If AVIC\nis fully enabled prior to running L2, and is then inhibited while L2 is\nactive (for a VM-scoped inhibit), then KVM will run L1 with AVIC disabled,\nbut with x2APIC MSR intercepts disabled, i.e. will allow L1 to read most of\nthe host\u0027s APIC state, send arbitrary interrupts, change task priority, and\nultimately trivially DoS the host.\n\nE.g. sending a self-IPI in L1 on HYPERV_REENLIGHTENMENT_VECTOR, 0xee, with\nCONFIG_HYPERV=n in the host kernel as a \"safe\" PoC, yields:\n\n  Spurious interrupt (vector 0xee) on CPU#425. Acked\n\nAnd hacking KVM to abuse kvm_set_posted_intr_wakeup_handler() to register a\nhandler and WARN on POSTED_INTR_WAKEUP_VECTOR yields:\n\n  ------------[ cut here ]------------\n  WARNING: arch/x86/kvm/svm/svm.c:5594 at pi_wakeup_handler+0x9/0x10 [kvm_amd], CPU#156: nested_x2apic_t/316940\n  CPU: 156 UID: 0 PID: 316940 Comm: nested_x2apic_t Tainted: G S   U\n  Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER\n  Hardware name: Google Astoria-Turin/astoria, BIOS 0.20260209.0-0 02/09/2026\n  RIP: 0010:pi_wakeup_handler+0x9/0x10 [kvm_amd]\n  Call Trace:\n   \u003cIRQ\u003e\n   sysvec_kvm_posted_intr_wakeup_ipi+0x64/0x80\n   \u003c/IRQ\u003e\n   \u003cTASK\u003e\n   asm_sysvec_kvm_posted_intr_wakeup_ipi+0x1a/0x20\n  RIP: 0010:vcpu_run+0x1430/0x1e40 [kvm]\n   kvm_arch_vcpu_ioctl_run+0x2c1/0x600 [kvm]\n   kvm_vcpu_ioctl+0x580/0x6b0 [kvm]\n   __se_sys_ioctl+0x6d/0xb0\n   do_syscall_64+0x10a/0x480\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n  RIP: 0033:0x46ff4b\n   \u003c/TASK\u003e\n  ---[ end trace 0000000000000000 ]---"
        }
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            "version": "3.1"
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              "value": "AV:L - Exploitation requires triggering KVM nested SVM/AVIC paths via local /dev/kvm ioctls (KVM_CREATE_VM, KVM_CREATE_VCPU, KVM_RUN) from L1; there is no network, adjacent, or physical packet/device path to the vulnerable code.\nAC:L - An L1 attacker fully controls nested VM configuration (x2APIC, AVIC, L2 MSR bitmap, IRQ-window/ExtINT conditions) and can reliably reproduce AVIC inhibition while L2 is active without races or uncontrollable host state.\nPR:H - Reaching the bug requires running nested AMD KVM as L1 (nested virtualization enabled and control of a guest hypervisor), which is not available to an unprivileged host user or via user-namespace capabilities alone without delegated /dev/kvm access.\nUI:N - No victim interaction is required; exploitation is driven entirely by the attacker\u2019s nested hypervisor configuration and KVM_RUN operations once nested virtualization is available.\nS:C - The flaw lets an L1 nested guest hypervisor access the host\u2019s physical x2APIC MSRs, crossing the VM/host security boundary rather than staying within the guest\u2019s own security scope.\nC:H - With x2APIC MSR intercepts left disabled, L1 can read most of the host APIC state (IDs, IRR/ISR, timers, ICR), leaking sensitive host interrupt-controller information beyond the guest boundary.\nI:H - L1 can write host x2APIC MSRs to send arbitrary IPIs, change task priority, and invoke host interrupt vectors (e.g. posted-interrupt wakeup), enabling host integrity compromise beyond mere guest-local effects.\nA:H - Host availability is trivially impacted by injecting spurious or high-priority interrupts to host CPUs; the fix commit demonstrates host kernel warnings and spurious interrupt storms causing denial of service."
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        "dateUpdated": "2026-08-19T16:38:16.902Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/7d3aae206663c4e006b25a1c7a20a4029e67da76"
        }
      ],
      "title": "KVM: SVM: Update x2APIC MSR intercepts if AVIC is inhibited while L2 is active",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74516",
    "datePublished": "2026-08-15T12:27:36.200Z",
    "dateReserved": "2026-08-15T05:44:03.910Z",
    "dateUpdated": "2026-08-19T16:38:16.902Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-08-28",
      "epss": "0.00135",
      "percentile": "0.03229"
    },
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      "cve": "CVE-2026-74516",
      "id": "msrc_CVE-2026-74516",
      "initial_release_date": "2026-08-23T15:04:41.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "KVM: SVM: Update x2APIC MSR intercepts if AVIC is inhibited while L2 is active",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74516.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74516\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T13:17:56.737\",\"lastModified\":\"2026-08-19T17:21:08.400\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: SVM: Update x2APIC MSR intercepts if AVIC is inhibited while L2 is active\\n\\nAlways update x2APIC MSR intercepts for L1 when AVIC is deactivated, even\\nif L2 is active and KVM is using a separate MSR bitmap to run L2.  If AVIC\\nis fully enabled prior to running L2, and is then inhibited while L2 is\\nactive (for a VM-scoped inhibit), then KVM will run L1 with AVIC disabled,\\nbut with x2APIC MSR intercepts disabled, i.e. will allow L1 to read most of\\nthe host\u0027s APIC state, send arbitrary interrupts, change task priority, and\\nultimately trivially DoS the host.\\n\\nE.g. sending a self-IPI in L1 on HYPERV_REENLIGHTENMENT_VECTOR, 0xee, with\\nCONFIG_HYPERV=n in the host kernel as a \\\"safe\\\" PoC, yields:\\n\\n  Spurious interrupt (vector 0xee) on CPU#425. Acked\\n\\nAnd hacking KVM to abuse kvm_set_posted_intr_wakeup_handler() to register a\\nhandler and WARN on POSTED_INTR_WAKEUP_VECTOR yields:\\n\\n  ------------[ cut here ]------------\\n  WARNING: arch/x86/kvm/svm/svm.c:5594 at pi_wakeup_handler+0x9/0x10 [kvm_amd], CPU#156: nested_x2apic_t/316940\\n  CPU: 156 UID: 0 PID: 316940 Comm: nested_x2apic_t Tainted: G S   U\\n  Tainted: [S]=CPU_OUT_OF_SPEC, [U]=USER\\n  Hardware name: Google Astoria-Turin/astoria, BIOS 0.20260209.0-0 02/09/2026\\n  RIP: 0010:pi_wakeup_handler+0x9/0x10 [kvm_amd]\\n  Call Trace:\\n   \u003cIRQ\u003e\\n   sysvec_kvm_posted_intr_wakeup_ipi+0x64/0x80\\n   \u003c/IRQ\u003e\\n   \u003cTASK\u003e\\n   asm_sysvec_kvm_posted_intr_wakeup_ipi+0x1a/0x20\\n  RIP: 0010:vcpu_run+0x1430/0x1e40 [kvm]\\n   kvm_arch_vcpu_ioctl_run+0x2c1/0x600 [kvm]\\n   kvm_vcpu_ioctl+0x580/0x6b0 [kvm]\\n   __se_sys_ioctl+0x6d/0xb0\\n   do_syscall_64+0x10a/0x480\\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\\n  RIP: 0033:0x46ff4b\\n   \u003c/TASK\u003e\\n  ---[ end trace 0000000000000000 ]---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/x86/kvm/svm/avic.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"091abbf578f926e763adc0f577baeb7f405b4bdc\",\"lessThan\":\"4ca05385b3ddbd463be17c6d69ec76fca657081d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"091abbf578f926e763adc0f577baeb7f405b4bdc\",\"lessThan\":\"6664a5aea45318f4ec156a729949b474dd6e3159\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"091abbf578f926e763adc0f577baeb7f405b4bdc\",\"lessThan\":\"f12373625b4dc9bcc89c41872648878c73bb9272\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"091abbf578f926e763adc0f577baeb7f405b4bdc\",\"lessThan\":\"7668c58dcf465559dc7a0d2e95e9cb79cf47454b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"091abbf578f926e763adc0f577baeb7f405b4bdc\",\"lessThan\":\"89f9e8398e79c49886766fc24a84c37726231104\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"091abbf578f926e763adc0f577baeb7f405b4bdc\",\"lessThan\":\"7d3aae206663c4e006b25a1c7a20a4029e67da76\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/x86/kvm/svm/avic.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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:H/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.5,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4ca05385b3ddbd463be17c6d69ec76fca657081d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6664a5aea45318f4ec156a729949b474dd6e3159\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7668c58dcf465559dc7a0d2e95e9cb79cf47454b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7d3aae206663c4e006b25a1c7a20a4029e67da76\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/89f9e8398e79c49886766fc24a84c37726231104\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f12373625b4dc9bcc89c41872648878c73bb9272\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-21T11:31:52+00:00",
      "cve": "CVE-2026-74516",
      "id": "CVE-2026-74516",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: SVM: Update x2APIC MSR intercepts if AVIC is inhibited while L2 is active",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74516.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.