{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.105-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.8-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.107-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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:    \u003cIRQ\u003e    sysvec_kvm_posted_intr_wakeup_ipi+0x64/0x80    \u003c/IRQ\u003e    \u003cTASK\u003e    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    \u003c/TASK\u003e   ---[ end trace 0000000000000000 ]---",
  "id": "DEBIAN-CVE-2026-74516",
  "modified": "2026-09-19T21:47:23.744990837Z",
  "published": "2026-08-15T13:17:56.737Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74516"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-74516"
  ]
}