{"id":"CVE-2026-80684","state":"PUBLISHED","title":"KVM: s390: pci: Fix NULL dereference on AIBV allocation failure","description":"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.","publishedAt":"2026-08-28T06:52:50.703Z","updatedAt":"2026-10-16T19:26:33.268Z","severity":{"score":9.3,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"96099486b63985801c9c6ef22505e9aa635b2d20","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"0a95abe964400771ad82b027d7b84a0d183cd0db","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"df947d85e164a50a29d43a96e814f69ab1d0f7ed","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"e137d082325bbcae780087b57501d38585e625d9","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"d1a103dc9016c25e7423ce5841a5cc2df76d59f3","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"8bf09b9b7d3232806df95f409581f8a9fd99a3fa","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/pci.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/pci.c"]}],"references":["https://git.kernel.org/stable/c/96099486b63985801c9c6ef22505e9aa635b2d20","https://git.kernel.org/stable/c/0a95abe964400771ad82b027d7b84a0d183cd0db","https://git.kernel.org/stable/c/df947d85e164a50a29d43a96e814f69ab1d0f7ed","https://git.kernel.org/stable/c/e137d082325bbcae780087b57501d38585e625d9","https://git.kernel.org/stable/c/d1a103dc9016c25e7423ce5841a5cc2df76d59f3","https://git.kernel.org/stable/c/8bf09b9b7d3232806df95f409581f8a9fd99a3fa"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80684.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80684","state":"PUBLISHED","datePublished":"2026-08-28T06:52:50.703Z","dateUpdated":"2026-10-16T19:26:33.268Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.784Z"},"containers":{"cna":{"title":"KVM: s390: pci: Fix NULL dereference on AIBV allocation failure","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"96099486b63985801c9c6ef22505e9aa635b2d20","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"0a95abe964400771ad82b027d7b84a0d183cd0db","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"df947d85e164a50a29d43a96e814f69ab1d0f7ed","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"e137d082325bbcae780087b57501d38585e625d9","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"d1a103dc9016c25e7423ce5841a5cc2df76d59f3","versionType":"git"},{"version":"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc","status":"affected","lessThan":"8bf09b9b7d3232806df95f409581f8a9fd99a3fa","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/pci.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/s390/kvm/pci.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-29T06:22:11.509Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-80684","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T19:19:58.006717Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:26:33.268Z"}}]}}}