{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80684","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.784Z","datePublished":"2026-08-28T06:52:50.703Z","dateUpdated":"2026-08-29T06:22:11.509Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-29T06:22:11.509Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: pci: Fix NULL dereference on AIBV allocation failure\n\nThe airq_iv_create() can return NULL on failure, but the return value was\nnever checked. If it fails, zdev->aibv will be NULL and fail when\ndereferenced in kvm_zpci_set_airq(). Add a NULL check and free the\npreviously allocated AISB bit and zdev->aisb on failure."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","baseScore":9.3,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached through the KVM_S390_ZPCI_OP VM ioctl (kvm_arch_vm_ioctl -> kvm_s390_pci_zpci_op -> kvm_s390_pci_aif_enable), a local syscall on the s390 hypervisor host, not via any network-facing kernel service.\nAC:L - An attacker can reliably trigger airq_iv_create() failure and the subsequent NULL dereference by issuing KVM_S390_ZPCIOP_REG_AEN under controlled host memory pressure or repeated registration attempts while holding a valid passthrough zPCI device context.\nPR:N - A malicious KVM guest with an assigned VFIO zPCI passthrough device can cause QEMU to issue KVM_S390_ZPCIOP_REG_AEN during normal adapter-event setup without possessing any host-root or init-namespace administrative credentials.\nUI:N - Exploitation requires no action by a separate victim user; triggering occurs through the attacker's own guest workload or VMM issuing the REG_AEN ioctl during standard zPCI passthrough interrupt-forwarding registration.\nS:C - The vulnerable KVM host code executes on behalf of a guest's passthrough device setup, and the resulting host kernel crash or corrupted global AIFT/GAIT interrupt-forwarding state impacts the hypervisor and resources outside the attacking guest's security boundary.\nC:H - Before the NULL dereference, unchecked allocation failure still populates host GAIT/summary-bit tables with attacker-influenced interrupt-routing fields, enabling misdelivery or exposure of adapter events intended for other guests or host contexts.\nI:H - Failed AIBV allocation leaves partially written host kernel interrupt-forwarding metadata (GAIT entries, kzdev pointers, summary-bit assignments) under attacker-controlled ioctl parameters, constituting exploitable kernel memory corruption prior to the crash.\nA:H - When zdev->aibv is NULL, kvm_zpci_set_airq() dereferences zdev->aibv->vector and airq_iv_end(zdev->aibv), causing a host kernel oops/panic that denies availability to all VMs on the system."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/pci.c"],"versions":[{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","lessThan":"96099486b63985801c9c6ef22505e9aa635b2d20","status":"affected","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","lessThan":"0a95abe964400771ad82b027d7b84a0d183cd0db","status":"affected","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","lessThan":"df947d85e164a50a29d43a96e814f69ab1d0f7ed","status":"affected","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","lessThan":"e137d082325bbcae780087b57501d38585e625d9","status":"affected","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","lessThan":"d1a103dc9016c25e7423ce5841a5cc2df76d59f3","status":"affected","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","lessThan":"8bf09b9b7d3232806df95f409581f8a9fd99a3fa","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/s390/kvm/pci.c"],"versions":[{"version":"6.0","status":"affected"},{"version":"0","lessThan":"6.0","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.151","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.103","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.44","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.8","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":"6.0","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/96099486b63985801c9c6ef22505e9aa635b2d20"},{"url":"https://git.kernel.org/stable/c/0a95abe964400771ad82b027d7b84a0d183cd0db"},{"url":"https://git.kernel.org/stable/c/df947d85e164a50a29d43a96e814f69ab1d0f7ed"},{"url":"https://git.kernel.org/stable/c/e137d082325bbcae780087b57501d38585e625d9"},{"url":"https://git.kernel.org/stable/c/d1a103dc9016c25e7423ce5841a5cc2df76d59f3"},{"url":"https://git.kernel.org/stable/c/8bf09b9b7d3232806df95f409581f8a9fd99a3fa"}],"title":"KVM: s390: pci: Fix NULL dereference on AIBV allocation failure","x_generator":{"engine":"bippy-1.2.0"}}}}