CVE-2026-80684 (GCVE-0-2026-80684)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:52 – Updated: 2026-08-29 06:22
VLAI
Title
KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Fix NULL dereference on AIBV allocation failure The airq_iv_create() can return NULL on failure, but the return value was never checked. If it fails, zdev->aibv will be NULL and fail when dereferenced in kvm_zpci_set_airq(). Add a NULL check and free the previously allocated AISB bit and zdev->aisb on failure.
Severity
9.3 (Critical)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < 96099486b63985801c9c6ef22505e9aa635b2d20 (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < 0a95abe964400771ad82b027d7b84a0d183cd0db (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < df947d85e164a50a29d43a96e814f69ab1d0f7ed (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < e137d082325bbcae780087b57501d38585e625d9 (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < d1a103dc9016c25e7423ce5841a5cc2df76d59f3 (git)
Affected: 3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc , < 8bf09b9b7d3232806df95f409581f8a9fd99a3fa (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 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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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "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-\u003eaibv 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-\u003eaisb on failure."
        }
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "value": "AV:L - The bug is reached through the KVM_S390_ZPCI_OP VM ioctl (kvm_arch_vm_ioctl -\u003e kvm_s390_pci_zpci_op -\u003e 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\u0027s 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\u0027s 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\u0027s 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-\u003eaibv is NULL, kvm_zpci_set_airq() dereferences zdev-\u003eaibv-\u003evector and airq_iv_end(zdev-\u003eaibv), causing a host kernel oops/panic that denies availability to all VMs on the system."
            }
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        "dateUpdated": "2026-08-29T06:22:11.509Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/8bf09b9b7d3232806df95f409581f8a9fd99a3fa"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80684",
    "datePublished": "2026-08-28T06:52:50.703Z",
    "dateReserved": "2026-08-26T14:34:25.784Z",
    "dateUpdated": "2026-08-29T06:22:11.509Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-80684",
      "date": "2026-08-31",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T10:52:21+00:00",
      "cve": "CVE-2026-80684",
      "id": "CVE-2026-80684",
      "initial_release_date": "2026-08-28T00:00:00+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 NULL dereference on AIBV allocation failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80684.json",
      "version": "3"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.