CVE-2026-68454 (GCVE-0-2026-68454)

Vulnerability from cvelistv5 – Published: 2026-08-13 13:59 – Updated: 2026-08-17 05:05
VLAI
Title
KVM: s390: pci: Fix handling of AIF enable without AISB
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Fix handling of AIF enable without AISB When a guest seeks to register IRQs without a summary bit specified, ensure that the associated GAITE then stores 0 for the guest AISB location instead of virt_to_phys(page_address(NULL)).
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < f887df91826e72b570c5e9298e66dd929f09edde (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < 3ef3190e30601b2688bdc64169b938b8d7f42010 (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < d48b9b096d11e31690c0a4988f65f21b64c01b2a (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < df72596278b0e22dac5ef2881e9221a3a2c4ed11 (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < 124a3769c43713a11a93a821b313e61ad5110cb8 (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < 3e3aa6da87d30a0064a17b836685cd43c90a3572 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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))."
        }
      ],
      "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\u0027s security authority \u2014 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) \u2014 an atomic OR write at a wild host kernel address \u2014 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": "2026-08-17T05:05:54.455Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f887df91826e72b570c5e9298e66dd929f09edde"
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        {
          "url": "https://git.kernel.org/stable/c/3ef3190e30601b2688bdc64169b938b8d7f42010"
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        },
        {
          "url": "https://git.kernel.org/stable/c/3e3aa6da87d30a0064a17b836685cd43c90a3572"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68454",
    "datePublished": "2026-08-13T13:59:57.209Z",
    "dateReserved": "2026-07-30T09:28:09.395Z",
    "dateUpdated": "2026-08-17T05:05:54.455Z",
    "state": "PUBLISHED"
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      "date": "2026-09-21",
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      "cve": "CVE-2026-68454",
      "id": "msrc_CVE-2026-68454",
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      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "KVM: s390: pci: Fix handling of AIF enable without AISB",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-68454.json",
      "version": "2"
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          }
        ],
        "id": "CVE-2026-68454",
        "lastModified": "2026-08-17T06:17:54.547",
        "metrics": {
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              "cvssData": {
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                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-08-13T23:27:49+00:00",
      "cve": "CVE-2026-68454",
      "id": "CVE-2026-68454",
      "initial_release_date": "2026-08-13T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: s390: pci: Fix handling of AIF enable without AISB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68454.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T01:33:26Z",
      "cve": "CVE-2026-68454",
      "id": "CVE-2026-68454",
      "initial_release_date": "2026-08-25T01:23:05Z",
      "product_status:known_affected": "177",
      "product_status:known_not_affected": "185",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68454",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68454.json",
      "version": "4"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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