Vulnerability-Lookup

GHSA-4H5W-742Q-HW8J

Vulnerability from github – Published: 2026-08-13 15:34 – Updated: 2026-08-14 00:31

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68454"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-13T15:19:58Z",
    "severity": "HIGH"
  },
  "details": "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)).",
  "id": "GHSA-4h5w-742q-hw8j",
  "modified": "2026-08-14T00:31:59Z",
  "published": "2026-08-13T15:34:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68454"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/124a3769c43713a11a93a821b313e61ad5110cb8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e3aa6da87d30a0064a17b836685cd43c90a3572"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ef3190e30601b2688bdc64169b938b8d7f42010"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d48b9b096d11e31690c0a4988f65f21b64c01b2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df72596278b0e22dac5ef2881e9221a3a2c4ed11"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f887df91826e72b570c5e9298e66dd929f09edde"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-08-13 13:59 – Updated: 2026-08-17 05:05

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

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/f887df91826e72b57…
https://git.kernel.org/stable/c/3ef3190e30601b268…
https://git.kernel.org/stable/c/d48b9b096d11e3169…
https://git.kernel.org/stable/c/df72596278b0e22da…
https://git.kernel.org/stable/c/124a3769c43713a11…
https://git.kernel.org/stable/c/3e3aa6da87d30a006…

Impacted products

2 products

Vendor	Product	Version
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)
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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kvm/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f887df91826e72b570c5e9298e66dd929f09edde",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "3ef3190e30601b2688bdc64169b938b8d7f42010",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "d48b9b096d11e31690c0a4988f65f21b64c01b2a",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "df72596278b0e22dac5ef2881e9221a3a2c4ed11",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "124a3769c43713a11a93a821b313e61ad5110cb8",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            },
            {
              "lessThan": "3e3aa6da87d30a0064a17b836685cd43c90a3572",
              "status": "affected",
              "version": "3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kvm/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.178",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
      },
      "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 AISB",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-4H5W-742Q-HW8J

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

Tags

Sightings

Nomenclature