{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72283", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.917Z", "datePublished": "2026-08-15T05:55:06.959Z", "dateUpdated": "2026-08-17T05:42:18.185Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:42:18.185Z" }, "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": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/kvm/irq.c" ], "versions": [ { "version": "77e1b8332d1d7aa786f7515e9bd4055def6a1e06", "lessThan": "d1379888cc4230bac647ec24ab83306afbd03e88", "status": "affected", "versionType": "git" }, { "version": "77e1b8332d1d7aa786f7515e9bd4055def6a1e06", "lessThan": "d5560b6569cd05ba72c6b33427fbabc6ec46b8cf", "status": "affected", "versionType": "git" }, { "version": "77e1b8332d1d7aa786f7515e9bd4055def6a1e06", "lessThan": "ed446e8aa894883c08892cfee69782fdf8f6c3ca", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/x86/kvm/irq.c" ], "versions": [ { "version": "6.17", "status": "affected" }, { "version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }