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CVE-2026-52968 (GCVE-0-2026-52968)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-08-05 12:32
VLAI
Title
KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic
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.
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: 73f91b004321f2510fa79e66035dbbf1870fcf56 , < 31a9d9f9942885aae356a1a57c79e82c5b5b0828 (git)
Affected: 73f91b004321f2510fa79e66035dbbf1870fcf56 , < a99a25db131ece5e6c0f7632da606de631efe4f2 (git)
Affected: 73f91b004321f2510fa79e66035dbbf1870fcf56 , < 11b8ff5b930b351dd1f6f088dce0beb027ac92d0 (git)
Affected: 73f91b004321f2510fa79e66035dbbf1870fcf56 , < b22a2da8792a7bfe743c1a922e77fa499ddedbe8 (git)
Affected: 73f91b004321f2510fa79e66035dbbf1870fcf56 , < e7216651b94e92e5433fb2f54b77864642b4ea48 (git)
Affected: 73f91b004321f2510fa79e66035dbbf1870fcf56 , < 16d990a15491cf76cd6eef0846e1b4100e63261a (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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."
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              "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."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-06-24T16:28:47.438Z",
    "dateReserved": "2026-06-09T07:44:35.375Z",
    "dateUpdated": "2026-08-05T12:32:12.815Z",
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      "cve": "CVE-2026-52968",
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      "product_status:fixed": "1",
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      "status": "final",
      "title": "KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-18T08:05:45+00:00",
      "cve": "CVE-2026-52968",
      "id": "CVE-2026-52968",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "28",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: s390: pci: fix GAIT table indexing due to double-scaling pointer arithmetic",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52968.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T02:42:35Z",
      "cve": "CVE-2026-52968",
      "id": "CVE-2026-52968",
      "initial_release_date": "2026-06-26T02:14:28Z",
      "product_status:known_affected": "166",
      "product_status:known_not_affected": "221",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52968",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52968.json",
      "version": "5"
    }
  }
}



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