CVE-2026-63806 (GCVE-0-2026-63806)

Vulnerability from cvelistv5 – Published: 2026-07-19 12:02 – Updated: 2026-07-20 13:40
VLAI
Title
KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned() Drop a BUG_ON() that has been reachable since it was first added, way back in 2009, and instead use get_unaligned() to perform potentially-unaligned accesses. For a given store, KVM x86's emulator tracks the entire value in the destination operand, x86_emulate_ctxt.dst. If the destination is memory, and the target splits multiple pages and/or is emulated MMIO, then KVM handles each fragment independently. E.g. on a page split starting at page offset 0xffc, KVM writes 4 bytes to the first page, then the remaining bytes to the second page, using ctxt->dst as the source for both (with appropriate offsets). If the destination splits a page *and* hits emulated MMIO on the second page, then KVM will complete the write to the first page, then emulate the MMIO access to the second page. If there is a datamatch-enabled ioeventfd at offset 0 of the second page, then KVM will process the remainder of the store as a potential ioeventfd signal. Putting it all together, if the guest emits a store that splits a page starting at page offset N, and the second page has a datamatch-enabled ioeventfd at offset 0, then KVM will check for datamatch using &dst.valptr[N] as the source. Due to dst (and thus dst.valptr) being 32-byte aligned, if N is not aligned to @len, the BUG_ON() fires. E.g. with a 16-byte store at page offset 0xffc, to an ioeventfd of len 8, all initial checks in ioeventfd_in_range() will succeed, and the BUG_ON() fires due to @val being 4-byte aligned, but not 8-byte aligned. ------------[ cut here ]------------ kernel BUG at arch/x86/kvm/../../../virt/kvm/eventfd.c:783! Oops: invalid opcode: 0000 [#1] SMP CPU: 0 UID: 1000 PID: 615 Comm: repro Not tainted 7.1.0-rc2-ff238429d1ea #365 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:ioeventfd_write+0x6c/0x70 [kvm] Call Trace: <TASK> __kvm_io_bus_write+0x85/0xb0 [kvm] kvm_io_bus_write+0x53/0x80 [kvm] vcpu_mmio_write+0x66/0xf0 [kvm] emulator_read_write_onepage+0x12a/0x540 [kvm] emulator_read_write+0x109/0x2b0 [kvm] x86_emulate_insn+0x4f8/0xfb0 [kvm] x86_emulate_instruction+0x181/0x790 [kvm] kvm_mmu_page_fault+0x313/0x630 [kvm] vmx_handle_exit+0x18a/0x590 [kvm_intel] kvm_arch_vcpu_ioctl_run+0xc81/0x1c90 [kvm] kvm_vcpu_ioctl+0x2d5/0x970 [kvm] __x64_sys_ioctl+0x8a/0xd0 do_syscall_64+0xb7/0x890 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f19c931a9bf </TASK> Modules linked in: kvm_intel kvm irqbypass ---[ end trace 0000000000000000 ]--- In a perfect world, the fix would be to simply delete the BUG_ON(), as KVM x86 doesn't perform alignment checks on "normal" memory accesses at CPL0. Sadly, C99 ruins all the fun; while the x86 architecture plays nice, dereferencing an unaligned pointer directly is undefined behavior in C, e.g. triggers splats when running with CONFIG_UBSAN_ALIGNMENT=y.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d34e6b175e61821026893ec5298cc8e7558df43a , < bf89e3738480d33cd515b4a18900e8443d40cd2e (git)
Affected: d34e6b175e61821026893ec5298cc8e7558df43a , < 5da9b1a87ec7cc3489c27016313524769f12d9e0 (git)
Affected: d34e6b175e61821026893ec5298cc8e7558df43a , < 5c87b47374682f69686068ad0a7779365a527b1c (git)
Affected: d34e6b175e61821026893ec5298cc8e7558df43a , < f1edbed787ba67988ed34e0132ca128b052b6ce8 (git)
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Linux Linux Affected: 2.6.32
Unaffected: 0 , < 2.6.32 (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
  "containers": {
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      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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-\u003edst 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\u0026dst.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   \u003cTASK\u003e\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   \u003c/TASK\u003e\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\u0027t 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."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
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      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:40:15.599Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/f1edbed787ba67988ed34e0132ca128b052b6ce8"
        }
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      "title": "KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63806",
    "datePublished": "2026-07-19T12:02:10.209Z",
    "dateReserved": "2026-07-19T07:54:57.013Z",
    "dateUpdated": "2026-07-20T13:40:15.599Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63806",
      "date": "2026-07-21",
      "epss": "0.00147",
      "percentile": "0.04403"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-20T14:42:21.000Z",
      "cve": "CVE-2026-63806",
      "id": "msrc_CVE-2026-63806",
      "initial_release_date": "2026-07-20T01:03:04.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63806.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63806\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T12:16:53.340\",\"lastModified\":\"2026-07-20T15:16:47.370\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027s 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-\u003edst 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\u0026dst.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   \u003cTASK\u003e\\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   \u003c/TASK\u003e\\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\u0027t 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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"virt/kvm/eventfd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d34e6b175e61821026893ec5298cc8e7558df43a\",\"lessThan\":\"bf89e3738480d33cd515b4a18900e8443d40cd2e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d34e6b175e61821026893ec5298cc8e7558df43a\",\"lessThan\":\"5da9b1a87ec7cc3489c27016313524769f12d9e0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d34e6b175e61821026893ec5298cc8e7558df43a\",\"lessThan\":\"5c87b47374682f69686068ad0a7779365a527b1c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d34e6b175e61821026893ec5298cc8e7558df43a\",\"lessThan\":\"f1edbed787ba67988ed34e0132ca128b052b6ce8\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"virt/kvm/eventfd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.32\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.32\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.38\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.3\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"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:N/UI:N/S:C/C:N/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":4.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5c87b47374682f69686068ad0a7779365a527b1c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5da9b1a87ec7cc3489c27016313524769f12d9e0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf89e3738480d33cd515b4a18900e8443d40cd2e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1edbed787ba67988ed34e0132ca128b052b6ce8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-21T08:03:15+00:00",
      "cve": "CVE-2026-63806",
      "id": "CVE-2026-63806",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: Replace guest-triggerable BUG_ON() in ioeventfd datamatch with get_unaligned()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63806.json",
      "version": "3"
    }
  }
}



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