{"api_version":"1","generated_at":"2026-08-22T21:52:59+00:00","cve":"CVE-2026-72283","urls":{"html":"https://cve.report/CVE-2026-72283","api":"https://cve.report/api/cve/CVE-2026-72283.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72283","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72283"},"summary":{"title":"KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails\n\nNullify irqfd->producer if updating the IRTE for bypass fails, as leaving a\ndangling pointer will result in a use-after-free if the irqfd is reachable\nthrough KVM's routing, but the producer is freed separately.  E.g. for VFIO\nPCI, the producer is embedded in struct \"vfio_pci_irq_ctx\" and freed when\nthe vector is disabled, which can happen independent of routing updates.\n\n[sean: drop PPC change, massage changelog]","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:59","updated_at":"2026-08-17 06:18:30"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/ed446e8aa894883c08892cfee69782fdf8f6c3ca","name":"https://git.kernel.org/stable/c/ed446e8aa894883c08892cfee69782fdf8f6c3ca","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d1379888cc4230bac647ec24ab83306afbd03e88","name":"https://git.kernel.org/stable/c/d1379888cc4230bac647ec24ab83306afbd03e88","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d5560b6569cd05ba72c6b33427fbabc6ec46b8cf","name":"https://git.kernel.org/stable/c/d5560b6569cd05ba72c6b33427fbabc6ec46b8cf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72283","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72283","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 77e1b8332d1d7aa786f7515e9bd4055def6a1e06 d1379888cc4230bac647ec24ab83306afbd03e88 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 77e1b8332d1d7aa786f7515e9bd4055def6a1e06 d5560b6569cd05ba72c6b33427fbabc6ec46b8cf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 77e1b8332d1d7aa786f7515e9bd4055def6a1e06 ed446e8aa894883c08892cfee69782fdf8f6c3ca git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72283","cve":"CVE-2026-72283","epss":"0.001790000","percentile":"0.076920000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/x86/kvm/irq.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d1379888cc4230bac647ec24ab83306afbd03e88","status":"affected","version":"77e1b8332d1d7aa786f7515e9bd4055def6a1e06","versionType":"git"},{"lessThan":"d5560b6569cd05ba72c6b33427fbabc6ec46b8cf","status":"affected","version":"77e1b8332d1d7aa786f7515e9bd4055def6a1e06","versionType":"git"},{"lessThan":"ed446e8aa894883c08892cfee69782fdf8f6c3ca","status":"affected","version":"77e1b8332d1d7aa786f7515e9bd4055def6a1e06","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kvm/irq.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.17"},{"lessThan":"6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"6.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails\n\nNullify irqfd->producer if updating the IRTE for bypass fails, as leaving a\ndangling pointer will result in a use-after-free if the irqfd is reachable\nthrough KVM's routing, but the producer is freed separately.  E.g. for VFIO\nPCI, the producer is embedded in struct \"vfio_pci_irq_ctx\" and freed when\nthe vector is disabled, which can happen independent of routing updates.\n\n[sean: drop PPC change, massage changelog]"}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached only through local KVM VM ioctls (KVM_IRQFD, KVM_SET_GSI_ROUTING) and VFIO PCI IRQ ioctls that wire an irqfd consumer to a VFIO MSI/MSI-X producer; there is no network, adjacent-radio, or physical-device attack surface.\nAC:L - An attacker who can open the VM and VFIO fds controls both sides of the failure window (provoke kvm_pi_update_irte() to fail during irq_bypass_add_producer, disable the VFIO vector to free vfio_pci_irq_ctx, then change GSI routing) and can retry routing/affinity until the dangling irqfd->producer is dereferenced.\nPR:L - Exploitation requires only local access to KVM and VFIO device nodes to issue the relevant ioctls (typical for QEMU/libvirt kvm-group operators or cloud tenants running VMs with PCI passthrough), not full init-namespace root or capabilities obtainable only inside unprivileged user namespaces.\nUI:N - The use-after-free is triggered entirely by the attacker's own ioctl sequence and subsequent routing updates; no victim login, file open, mount, or other interactive action is required.\nS:C - The dangling producer is used to update IOMMU posted-interrupt IRTEs for VFIO-assigned PCI MSIs, crossing the guest/host device-assignment boundary; corrupting interrupt remapping can compromise the host kernel and enable VM escape rather than staying within the attacker's VM scope.\nC:H - This is a kernel heap use-after-free on irqfd->producer embedded in vfio_pci_irq_ctx; freed-object reuse supplies attacker-influenced host_irq values to irq_set_vcpu_affinity(), enabling arbitrary kernel memory reads and pointer disclosure, not merely a bounded leak.\nI:H - UAF of the VFIO irq producer plus mistaken irq_set_vcpu_affinity()/IRTE reprogramming with a stale or attacker-controlled IRQ number can corrupt host kernel heap metadata and IOMMU interrupt tables, providing a path to arbitrary write and code execution.\nA:H - Dereferencing the freed vfio_pci_irq_ctx from kvm_pi_update_irte() during kvm_irq_routing_update() can immediately BUG/WARN/oops the host kernel; even attempted exploitation of the UAF commonly crashes the host."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:42:18.185Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d1379888cc4230bac647ec24ab83306afbd03e88"},{"url":"https://git.kernel.org/stable/c/d5560b6569cd05ba72c6b33427fbabc6ec46b8cf"},{"url":"https://git.kernel.org/stable/c/ed446e8aa894883c08892cfee69782fdf8f6c3ca"}],"title":"KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72283","datePublished":"2026-08-15T05:55:06.959Z","dateReserved":"2026-08-09T03:40:39.917Z","dateUpdated":"2026-08-17T05:42:18.185Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:59","lastModifiedDate":"2026-08-17 06:18:30","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2,"impactScore":6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72283","Ordinal":"1","Title":"KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fa","CVE":"CVE-2026-72283","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72283","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Nullify irqfd->producer if updating IRTE for bypass fails\n\nNullify irqfd->producer if updating the IRTE for bypass fails, as leaving a\ndangling pointer will result in a use-after-free if the irqfd is reachable\nthrough KVM's routing, but the producer is freed separately.  E.g. for VFIO\nPCI, the producer is embedded in struct \"vfio_pci_irq_ctx\" and freed when\nthe vector is disabled, which can happen independent of routing updates.\n\n[sean: drop PPC change, massage changelog]","Type":"Description","Title":"KVM: x86: Nullify irqfd->producer if updating IRTE for bypass fa"}]}}}