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)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68454",
      "date": "2026-08-17",
      "epss": "0.00129",
      "percentile": "0.02981"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68454\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-13T15:19:58.210\",\"lastModified\":\"2026-08-17T06:17:54.547\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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)).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/s390/kvm/pci.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc\",\"lessThan\":\"f887df91826e72b570c5e9298e66dd929f09edde\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc\",\"lessThan\":\"3ef3190e30601b2688bdc64169b938b8d7f42010\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc\",\"lessThan\":\"d48b9b096d11e31690c0a4988f65f21b64c01b2a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc\",\"lessThan\":\"df72596278b0e22dac5ef2881e9221a3a2c4ed11\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc\",\"lessThan\":\"124a3769c43713a11a93a821b313e61ad5110cb8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc\",\"lessThan\":\"3e3aa6da87d30a0064a17b836685cd43c90a3572\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/s390/kvm/pci.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/124a3769c43713a11a93a821b313e61ad5110cb8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3e3aa6da87d30a0064a17b836685cd43c90a3572\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ef3190e30601b2688bdc64169b938b8d7f42010\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d48b9b096d11e31690c0a4988f65f21b64c01b2a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df72596278b0e22dac5ef2881e9221a3a2c4ed11\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f887df91826e72b570c5e9298e66dd929f09edde\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "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"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.