CVE-2026-52968 (GCVE-0-2026-52968)
Vulnerability from cvelistv5
Published
2026-06-24 16:28
Modified
2026-08-05 12:32
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic kvm_s390_pci_aif_enable(), kvm_s390_pci_aif_disable(), and aen_host_forward() index the GAIT by manually multiplying the index with sizeof(struct zpci_gaite). Since aift->gait is already a struct zpci_gaite pointer, this double-scales the offset, accessing element aisb*16 instead of aisb. This causes out-of-bounds accesses when aisb >= 32 (with ZPCI_NR_DEVICES=512) Fix by removing the erroneous sizeof multiplication.
References
Impacted products
Vendor Product Version
Linux Linux Version: 73f91b004321f2510fa79e66035dbbf1870fcf56
Version: 73f91b004321f2510fa79e66035dbbf1870fcf56
Version: 73f91b004321f2510fa79e66035dbbf1870fcf56
Version: 73f91b004321f2510fa79e66035dbbf1870fcf56
Version: 73f91b004321f2510fa79e66035dbbf1870fcf56
Version: 73f91b004321f2510fa79e66035dbbf1870fcf56
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kvm/interrupt.c",
            "arch/s390/kvm/pci.c"
          ],
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        {
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          "product": "Linux",
          "programFiles": [
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            "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"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.175",
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
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              "version": "7.0.10",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.175",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "6.0",
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                {
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                  "versionEndExcluding": "7.1",
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                  "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 GAIT table indexing due to double-scaling pointer arithmetic\n\nkvm_s390_pci_aif_enable(), kvm_s390_pci_aif_disable(), and\naen_host_forward() index the GAIT by manually multiplying the index\nwith sizeof(struct zpci_gaite).\n\nSince aift-\u003egait is already a struct zpci_gaite pointer, this\ndouble-scales the offset, accessing element aisb*16 instead of aisb.\n\nThis causes out-of-bounds accesses when aisb \u003e= 32 (with\nZPCI_NR_DEVICES=512)\n\nFix by removing the erroneous sizeof multiplication."
        }
      ],
      "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 local KVM/VFIO s390 zPCI management paths, specifically the `KVM_S390_ZPCI_OP` VM ioctl and host interrupt forwarding, not through network packets.\nAC:L - Once zPCI AEN interpretation is available and an AISB index of 32 or higher is allocated, the bad pointer arithmetic deterministically accesses the wrong GAIT entry; no attacker-uncontrolled race is required.\nPR:L - The attacker needs local ability to operate a KVM VM with an associated VFIO zPCI device or equivalent VM-management access, but the vulnerable ioctl itself does not require a real init-namespace root capability check.\nUI:N - After the attacker can issue the relevant KVM/VFIO operations or trigger adapter events for the assigned device, exploitation does not require a separate victim user action.\nS:C - This is KVM host-side memory corruption in a virtualization/device-assignment path, so a plausible exploit crosses the VM or assigned-device security boundary into host kernel resources.\nC:H - The bug performs out-of-bounds reads from page-allocator memory through the misindexed GAIT entry and can expose host kernel memory contents or pointers.\nI:H - The registration and deregistration paths perform out-of-bounds writes to fields including `gisa`, `gisc`, `count`, `aisbo`, and `aisb`, making host kernel memory corruption and potential code execution defensible.\nA:H - The same out-of-bounds reads and writes can corrupt arbitrary adjacent kernel memory or dereference corrupted physical addresses, making host crash or panic a high-probability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:32:12.815Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/31a9d9f9942885aae356a1a57c79e82c5b5b0828"
        },
        {
          "url": "https://git.kernel.org/stable/c/a99a25db131ece5e6c0f7632da606de631efe4f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/11b8ff5b930b351dd1f6f088dce0beb027ac92d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/b22a2da8792a7bfe743c1a922e77fa499ddedbe8"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7216651b94e92e5433fb2f54b77864642b4ea48"
        },
        {
          "url": "https://git.kernel.org/stable/c/16d990a15491cf76cd6eef0846e1b4100e63261a"
        }
      ],
      "title": "KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52968",
    "datePublished": "2026-06-24T16:28:47.438Z",
    "dateReserved": "2026-06-09T07:44:35.375Z",
    "dateUpdated": "2026-08-05T12:32:12.815Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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