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": {
      "cve": "CVE-2026-72329",
      "date": "2026-08-17",
      "epss": "0.0018",
      "percentile": "0.07816"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-72329\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:05.980\",\"lastModified\":\"2026-08-17T06:18:36.463\",\"vulnStatus\":\"Received\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"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\",\"versions\":[{\"version\":\"ca6139ffc67ee6ef0459f81e37894ed411083855\",\"lessThan\":\"81acef3a247fd523513a2e9f71de1c167bc0f882\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ca6139ffc67ee6ef0459f81e37894ed411083855\",\"lessThan\":\"5c0e3ba4f500fd4314ceb42f07f16bc445156431\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"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\",\"versions\":[{\"version\":\"4.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.10\",\"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:N/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":9.3,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5c0e3ba4f500fd4314ceb42f07f16bc445156431\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/81acef3a247fd523513a2e9f71de1c167bc0f882\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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

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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.
  • 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.