{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63806",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63806"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()\n\nDrop a BUG_ON() that has been reachable since it was first added, way back\nin 2009, and instead use get_unaligned() to perform potentially-unaligned\naccesses.\n\nFor a given store, KVM x86's emulator tracks the entire value in the\ndestination operand, x86_emulate_ctxt.dst.  If the destination is memory,\nand the target splits multiple pages and/or is emulated MMIO, then KVM\nhandles each fragment independently.  E.g. on a page split starting at page\noffset 0xffc, KVM writes 4 bytes to the first page, then the remaining\nbytes to the second page, using ctxt->dst as the source for both (with\nappropriate offsets).\n\nIf the destination splits a page *and* hits emulated MMIO on the second\npage, then KVM will complete the write to the first page, then emulate the\nMMIO access to the second page.  If there is a datamatch-enabled ioeventfd\nat offset 0 of the second page, then KVM will process the remainder of the\nstore as a potential ioeventfd signal.\n\nPutting it all together, if the guest emits a store that splits a page\nstarting at page offset N, and the second page has a datamatch-enabled\nioeventfd at offset 0, then KVM will check for datamatch using\n&dst.valptr[N] as the source.  Due to dst (and thus dst.valptr) being\n32-byte aligned, if N is not aligned to @len, the BUG_ON() fires.\n\nE.g. with a 16-byte store at page offset 0xffc, to an ioeventfd of len 8,\nall initial checks in ioeventfd_in_range() will succeed, and the BUG_ON()\nfires due to @val being 4-byte aligned, but not 8-byte aligned.\n\n  ------------[ cut here ]------------\n  kernel BUG at arch/x86/kvm/../../../virt/kvm/eventfd.c:783!\n  Oops: invalid opcode: 0000 [#1] SMP\n  CPU: 0 UID: 1000 PID: 615 Comm: repro Not tainted 7.1.0-rc2-ff238429d1ea #365 PREEMPT\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  RIP: 0010:ioeventfd_write+0x6c/0x70 [kvm]\n  Call Trace:\n   <TASK>\n   __kvm_io_bus_write+0x85/0xb0 [kvm]\n   kvm_io_bus_write+0x53/0x80 [kvm]\n   vcpu_mmio_write+0x66/0xf0 [kvm]\n   emulator_read_write_onepage+0x12a/0x540 [kvm]\n   emulator_read_write+0x109/0x2b0 [kvm]\n   x86_emulate_insn+0x4f8/0xfb0 [kvm]\n   x86_emulate_instruction+0x181/0x790 [kvm]\n   kvm_mmu_page_fault+0x313/0x630 [kvm]\n   vmx_handle_exit+0x18a/0x590 [kvm_intel]\n   kvm_arch_vcpu_ioctl_run+0xc81/0x1c90 [kvm]\n   kvm_vcpu_ioctl+0x2d5/0x970 [kvm]\n   __x64_sys_ioctl+0x8a/0xd0\n   do_syscall_64+0xb7/0x890\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n  RIP: 0033:0x7f19c931a9bf\n   </TASK>\n  Modules linked in: kvm_intel kvm irqbypass\n  ---[ end trace 0000000000000000 ]---\n\nIn a perfect world, the fix would be to simply delete the BUG_ON(), as KVM\nx86 doesn't perform alignment checks on \"normal\" memory accesses at CPL0.\nSadly, C99 ruins all the fun; while the x86 architecture plays nice,\ndereferencing an unaligned pointer directly is undefined behavior in C,\ne.g. triggers splats when running with CONFIG_UBSAN_ALIGNMENT=y.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-63806"
    },
    {
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      "url": "https://git.kernel.org/stable/c/2426c15c1395b7d5ccf1e5025ca898af7f3decb6"
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      "url": "https://git.kernel.org/stable/c/bf89e3738480d33cd515b4a18900e8443d40cd2e"
    },
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      "url": "https://git.kernel.org/stable/c/5da9b1a87ec7cc3489c27016313524769f12d9e0"
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    },
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - A malicious KVM guest triggers this via guest-executed MMIO stores handled by the x86 instruction emulator (KVM_RUN \u2192 vmx_handle_exit \u2192 kvm_mmu_page_fault \u2192 x86_emulate_instruction \u2192 emulator_read_write \u2192 vcpu_mmio_write \u2192 ioeventfd_write), not via remote network input to the host.\nAC:L - The guest fully controls the spanning store address, size, and timing; with standard QEMU/virtio datamatch ioeventfd MMIO layouts, a page-boundary write reliably reaches ioeventfd_in_range() with a misaligned val pointer and fires the BUG_ON().\nPR:N - Exploitation requires only unprivileged code execution inside an already-running guest VM (reproducer ran as UID 1000); no host capabilities, KVM ioctls, or guest root are needed beyond what any cloud VM tenant or compromised guest process already has.\nUI:N - No victim interaction is required once the attacker can run code in a KVM guest with a datamatch ioeventfd configured, which is the default virtio/QEMU setup.\nS:C - The vulnerable component is the host kernel KVM subsystem, but exploitation is initiated from a guest VM and causes a host kernel BUG/oops, crossing the hypervisor security boundary.\nC:N - The failure mode is an explicit BUG_ON() alignment check before any datamatch comparison; there is no out-of-bounds read, use-after-free, or other memory corruption that could disclose host data.\nI:N - The bug triggers a deliberate kernel BUG and does not corrupt or modify host memory; it is a crash-only denial-of-service with no integrity impact.\nA:H - A guest-triggered BUG_ON() in ioeventfd_write() causes a host kernel oops/panic, denying availability of the entire physical host and all co-resident VMs on multi-tenant KVM hypervisors."
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  }
}