{"api_version":"1","generated_at":"2026-08-14T05:29:29+00:00","cve":"CVE-2026-68454","urls":{"html":"https://cve.report/CVE-2026-68454","api":"https://cve.report/api/cve/CVE-2026-68454.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68454","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68454"},"summary":{"title":"KVM: s390: pci: Fix handling of AIF enable without AISB","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: pci: Fix handling of AIF enable without AISB\n\nWhen a guest seeks to register IRQs without a summary bit specified,\nensure that the associated GAITE then stores 0 for the guest AISB\nlocation instead of virt_to_phys(page_address(NULL)).","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-13 15:19:58","updated_at":"2026-08-13 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68454","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc f887df91826e72b570c5e9298e66dd929f09edde git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc 3ef3190e30601b2688bdc64169b938b8d7f42010 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc d48b9b096d11e31690c0a4988f65f21b64c01b2a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc df72596278b0e22dac5ef2881e9221a3a2c4ed11 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: pci: Fix handling of AIF enable without AISB\n\nWhen a guest seeks to register IRQs without a summary bit specified,\nensure that the associated GAITE then stores 0 for the guest AISB\nlocation instead of virt_to_phys(page_address(NULL))."}],"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 vulnerable code is reached through the KVM_S390_ZPCI_OP VM ioctl, issued by the userspace VMM on behalf of a guest executing the mpcifc \"register adapter interrupts\" instruction for an assigned zPCI device; no network path exists.\nAC:L - The guest simply registers adapter-event notification with no summary bit (sb == 0), which deterministically stores virt_to_phys(page_address(NULL)) into the GAITE; the subsequent wild access is then triggered at will by device interrupt activity or by deregistering/tearing down the VM.\nPR:L - The attacker needs access to a KVM VM file descriptor with an assigned zPCI device, i.e. control of a guest kernel or of the unprivileged QEMU process; no host root or init-namespace privilege is required.\nUI:N - The guest triggers the register/deregister sequence entirely on its own; no host administrator or other user action is needed.\nS:C - A guest action corrupts host kernel state outside the VM's security authority — the GAITE is host-owned and the resulting wild accesses occur in host kernel context, crossing the guest/hypervisor boundary.\nC:H - kvm_s390_pci_aif_disable() turns the bogus physical address into a struct page via phys_to_page() and reads folio metadata from it, an out-of-bounds vmemmap read; the resulting refcount underflow can free memory still in use, yielding a read primitive over host memory belonging to the hypervisor and other guests.\nI:H - aen_host_forward() performs set_bit_inv() on phys_to_virt(garbage) — an atomic OR write at a wild host kernel address — and unpin_user_page() decrements the refcount of a fabricated struct page, giving host memory corruption and a premature-free primitive usable for control-flow hijack.\nA:H - The wild atomic write in hard-IRQ context and the bogus struct page dereference reliably produce an addressing exception / kernel panic in the host, taking down the hypervisor and every guest on it."}]}],"providerMetadata":{"dateUpdated":"2026-08-13T22:45:21.178Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f887df91826e72b570c5e9298e66dd929f09edde"},{"url":"https://git.kernel.org/stable/c/3ef3190e30601b2688bdc64169b938b8d7f42010"},{"url":"https://git.kernel.org/stable/c/d48b9b096d11e31690c0a4988f65f21b64c01b2a"},{"url":"https://git.kernel.org/stable/c/df72596278b0e22dac5ef2881e9221a3a2c4ed11"},{"url":"https://git.kernel.org/stable/c/124a3769c43713a11a93a821b313e61ad5110cb8"},{"url":"https://git.kernel.org/stable/c/3e3aa6da87d30a0064a17b836685cd43c90a3572"}],"title":"KVM: s390: pci: Fix handling of AIF enable without 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then stores 0 for the guest AISB\nlocation instead of virt_to_phys(page_address(NULL)).","Type":"Description","Title":"KVM: s390: pci: Fix handling of AIF enable without AISB"}]}}}