CVE-2026-72329 (GCVE-0-2026-72329)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42
VLAI
Title
net/liquidio: drop cached VF pci_dev LUT
Summary
In the Linux kernel, the following vulnerability has been resolved: net/liquidio: drop cached VF pci_dev LUT The PF SR-IOV enable path caches VF pci_dev pointers in dpiring_to_vfpcidev_lut[] by iterating with pci_get_device(). Those entries do not own a reference, because the iterator drops the previous device reference on each step. The cached pointer is then dereferenced later when handling OCTEON_VF_FLR_REQUEST. Replace the cached VF mapping with runtime lookup on the mailbox DPI ring: derive the VF index from q_no, resolve the VF via exported PCI IOV helpers, validate it with the PF pointer and VF ID, then issue pcie_flr() and drop the reference with pci_dev_put(). Remove the unused VF lookup table initialization and cleanup.
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: ca6139ffc67ee6ef0459f81e37894ed411083855 , < 81acef3a247fd523513a2e9f71de1c167bc0f882 (git)
Affected: ca6139ffc67ee6ef0459f81e37894ed411083855 , < 5c0e3ba4f500fd4314ceb42f07f16bc445156431 (git)
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Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (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": [
            "drivers/net/ethernet/cavium/liquidio/lio_main.c",
            "drivers/net/ethernet/cavium/liquidio/octeon_device.h",
            "drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "81acef3a247fd523513a2e9f71de1c167bc0f882",
              "status": "affected",
              "version": "ca6139ffc67ee6ef0459f81e37894ed411083855",
              "versionType": "git"
            },
            {
              "lessThan": "5c0e3ba4f500fd4314ceb42f07f16bc445156431",
              "status": "affected",
              "version": "ca6139ffc67ee6ef0459f81e37894ed411083855",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/cavium/liquidio/lio_main.c",
            "drivers/net/ethernet/cavium/liquidio/octeon_device.h",
            "drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.10"
            },
            {
              "lessThan": "4.10",
              "status": "unaffected",
              "version": "0",
              "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": "7.1.5",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/liquidio: drop cached VF pci_dev LUT\n\nThe PF SR-IOV enable path caches VF pci_dev pointers in\ndpiring_to_vfpcidev_lut[] by iterating with pci_get_device(). Those\nentries do not own a reference, because the iterator drops the previous\ndevice reference on each step. The cached pointer is then dereferenced\nlater when handling OCTEON_VF_FLR_REQUEST.\n\nReplace the cached VF mapping with runtime lookup on the mailbox DPI\nring: derive the VF index from q_no, resolve the VF via exported PCI\nIOV helpers, validate it with the PF pointer and VF ID, then issue\npcie_flr() and drop the reference with pci_dev_put(). Remove the\nunused VF lookup table initialization and cleanup."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.3,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in the Cavium LiquidIO CN23XX PF driver handling OCTEON_VF_FLR_REQUEST over the PCIe SR-IOV hardware mailbox, not via network packets; exploitation requires code running against an assigned VF (e.g., a cloud VM with SR-IOV passthrough).\nAC:L - VF pci_dev pointers in dpiring_to_vfpcidev_lut[] are stale immediately after SR-IOV enable because pci_get_device() drops references during iteration; an attacker controlling VF driver teardown can reliably send OCTEON_VF_FLR_REQUEST and repeat FLR attempts to influence heap reuse.\nPR:N - In the highest-impact deployment (multi-tenant cloud with VF passthrough), a tenant needs no host administrator privileges\u2014only control of the assigned VF from within their VM\u2014to trigger PF mailbox processing and pcie_flr() on the dangling pci_dev.\nUI:N - No victim interaction is required; triggering VF driver removal or module unload during octeon_destroy_resources() automatically sends the FLR mailbox request to the PF without any user action on the host.\nS:C - The vulnerable PF driver executes in the host kernel but is triggered from an isolated VF guest/tenant via the SR-IOV mailbox, crossing the VM/tenant security boundary into host kernel context.\nC:H - This is a use-after-free of struct pci_dev; pcie_flr() and pci_dev_reset_iommu_prepare() dereference freed pci_dev fields, enabling arbitrary kernel memory disclosure if the attacker reclaims the object via heap spraying.\nI:H - UAF of pci_dev causes pcie_flr() to issue PCI Express FLR config writes and IOMMU blocking on attacker-influenced memory, providing memory corruption primitives that can be leveraged for arbitrary kernel write or code execution.\nA:H - Dereferencing a stale pci_dev in pcie_flr() can oops or panic the host kernel, and issuing FLR/IOMMU operations against the wrong PCI function can disrupt host networking and device availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:42:51.194Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/81acef3a247fd523513a2e9f71de1c167bc0f882"
        },
        {
          "url": "https://git.kernel.org/stable/c/5c0e3ba4f500fd4314ceb42f07f16bc445156431"
        }
      ],
      "title": "net/liquidio: drop cached VF pci_dev LUT",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72329",
    "datePublished": "2026-08-15T05:55:39.931Z",
    "dateReserved": "2026-08-09T03:40:39.919Z",
    "dateUpdated": "2026-08-17T05:42:51.194Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-21",
      "epss": "0.0018",
      "percentile": "0.07768"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-23T15:00:02.000Z",
      "cve": "CVE-2026-72329",
      "id": "msrc_CVE-2026-72329",
      "initial_release_date": "2026-08-23T15:00:02.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/liquidio: drop cached VF pci_dev LUT",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-72329.json",
      "version": "1"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/cavium/liquidio/lio_main.c",
                  "drivers/net/ethernet/cavium/liquidio/octeon_device.h",
                  "drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                    "versionType": "git"
                  },
                  {
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                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/cavium/liquidio/lio_main.c",
                  "drivers/net/ethernet/cavium/liquidio/octeon_device.h",
                  "drivers/net/ethernet/cavium/liquidio/octeon_mailbox.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "4.10"
                  },
                  {
                    "lessThan": "4.10",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.1.*",
                    "status": "unaffected",
                    "version": "7.1.5",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/liquidio: drop cached VF pci_dev LUT\n\nThe PF SR-IOV enable path caches VF pci_dev pointers in\ndpiring_to_vfpcidev_lut[] by iterating with pci_get_device(). Those\nentries do not own a reference, because the iterator drops the previous\ndevice reference on each step. The cached pointer is then dereferenced\nlater when handling OCTEON_VF_FLR_REQUEST.\n\nReplace the cached VF mapping with runtime lookup on the mailbox DPI\nring: derive the VF index from q_no, resolve the VF via exported PCI\nIOV helpers, validate it with the PF pointer and VF ID, then issue\npcie_flr() and drop the reference with pci_dev_put(). Remove the\nunused VF lookup table initialization and cleanup."
          }
        ],
        "id": "CVE-2026-72329",
        "lastModified": "2026-08-17T06:18:36.463",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 9.3,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 6.0,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-15T06:22:05.980",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5c0e3ba4f500fd4314ceb42f07f16bc445156431"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/81acef3a247fd523513a2e9f71de1c167bc0f882"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
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      "current_release_date": "2026-08-18T23:43:48+00:00",
      "cve": "CVE-2026-72329",
      "id": "CVE-2026-72329",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/liquidio: drop cached VF pci_dev LUT",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72329.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "critical",
      "current_release_date": "2026-09-15T01:26:55Z",
      "cve": "CVE-2026-72329",
      "id": "CVE-2026-72329",
      "initial_release_date": "2026-08-22T00:53:59Z",
      "product_status:known_affected": "356",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72329",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72329.json",
      "version": "4"
    }
  }
}



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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.
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  • 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.



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