CVE-2026-98756 (GCVE-0-2026-98756)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-30 12:39
VLAI
Title
usb: cdns3: Fix NULL pointer dereference in cdns3_pci_probe
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: cdns3: Fix NULL pointer dereference in cdns3_pci_probe The Cadence USBSS controller is a two-function PCI device. The first probed function allocates the driver data and stores it with pci_set_drvdata(), while the second function reuses it via pci_get_drvdata() when pci_is_enabled() reports that the first function has already been probed. When the second function is probed while the first one has been enabled but has not yet set its driver data, pci_get_drvdata() returns NULL, and the subsequent wrap->devfn assignment dereferences a NULL pointer and crashes the kernel. logs: Call trace: cdns3_pci_probe+0xa4/0x300 local_pci_probe+0x44/0xa8 pci_call_probe+0x54/0x158 pci_device_probe+0x84/0x100 really_probe+0x184/0x3d0 __driver_probe_device+0x80/0x178 driver_probe_device+0x44/0xe8 __driver_attach+0xec/0x1f8 bus_for_each_dev+0x7c/0xe0 driver_attach+0x28/0x38 bus_add_driver+0x110/0x238 driver_register+0x64/0x128 __pci_register_driver+0x50/0x60 cdns3_pci_driver_init+0x28/0x38 do_one_initcall+0x5c/0x280 do_initcalls+0x104/0x1d8 kernel_init_freeable+0x140/0x218 kernel_init+0x28/0x1f8 ret_from_fork+0x10/0x20 Return -EPROBE_DEFER in this case so that probing is retried after the first function has completed its probe.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7733f6c32e36ff9d7adadf40001039bf219b1cbe , < 399b18b18f54495eeeda8d88e039e6af27d020c9 (git)
Affected: 7733f6c32e36ff9d7adadf40001039bf219b1cbe , < 88b473800ae11397e2e169aff2e17b041c040409 (git)
Affected: 7733f6c32e36ff9d7adadf40001039bf219b1cbe , < fc13243658da9ed3c4c94aaff77c36a10f441b89 (git)
Affected: 7733f6c32e36ff9d7adadf40001039bf219b1cbe , < dbdd0ca9a7eac140697a366f698a0e2bb02a06a1 (git)
Affected: 7733f6c32e36ff9d7adadf40001039bf219b1cbe , < 549c04df02f1bb5a10342f32e2c87f5d27c97279 (git)
Affected: 7733f6c32e36ff9d7adadf40001039bf219b1cbe , < d16046f1ace2691b6a946f022fe6dc215936880b (git)
Affected: 7733f6c32e36ff9d7adadf40001039bf219b1cbe , < 45b606418bae73c7cde9f0e57e5b0977c816a7c0 (git)
Affected: 7733f6c32e36ff9d7adadf40001039bf219b1cbe , < e5052f2c5c73c1dcca42bafc0bc737af2b2af059 (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/cdns3/cdns3-pci-wrap.c"
          ],
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: cdns3: Fix NULL pointer dereference in cdns3_pci_probe\n\nThe Cadence USBSS controller is a two-function PCI device. The first\nprobed function allocates the driver data and stores it with\npci_set_drvdata(), while the second function reuses it via\npci_get_drvdata() when pci_is_enabled() reports that the first\nfunction has already been probed.\n\nWhen the second function is probed while the first one has been\nenabled but has not yet set its driver data, pci_get_drvdata()\nreturns NULL, and the subsequent wrap-\u003edevfn assignment dereferences\na NULL pointer and crashes the kernel.\nlogs:\nCall trace:\n  cdns3_pci_probe+0xa4/0x300\n  local_pci_probe+0x44/0xa8\n  pci_call_probe+0x54/0x158\n  pci_device_probe+0x84/0x100\n  really_probe+0x184/0x3d0\n  __driver_probe_device+0x80/0x178\n  driver_probe_device+0x44/0xe8\n  __driver_attach+0xec/0x1f8\n  bus_for_each_dev+0x7c/0xe0\n  driver_attach+0x28/0x38\n  bus_add_driver+0x110/0x238\n  driver_register+0x64/0x128\n  __pci_register_driver+0x50/0x60\n  cdns3_pci_driver_init+0x28/0x38\n  do_one_initcall+0x5c/0x280\n  do_initcalls+0x104/0x1d8\n  kernel_init_freeable+0x140/0x218\n  kernel_init+0x28/0x1f8\n  ret_from_fork+0x10/0x20\n\nReturn -EPROBE_DEFER in this case so that probing is retried after\nthe first function has completed its probe."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:39:26.925Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/399b18b18f54495eeeda8d88e039e6af27d020c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/88b473800ae11397e2e169aff2e17b041c040409"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc13243658da9ed3c4c94aaff77c36a10f441b89"
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        {
          "url": "https://git.kernel.org/stable/c/dbdd0ca9a7eac140697a366f698a0e2bb02a06a1"
        },
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          "url": "https://git.kernel.org/stable/c/549c04df02f1bb5a10342f32e2c87f5d27c97279"
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          "url": "https://git.kernel.org/stable/c/d16046f1ace2691b6a946f022fe6dc215936880b"
        },
        {
          "url": "https://git.kernel.org/stable/c/45b606418bae73c7cde9f0e57e5b0977c816a7c0"
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        {
          "url": "https://git.kernel.org/stable/c/e5052f2c5c73c1dcca42bafc0bc737af2b2af059"
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      ],
      "title": "usb: cdns3: Fix NULL pointer dereference in cdns3_pci_probe",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98756",
    "datePublished": "2026-10-18T15:47:42.085Z",
    "dateReserved": "2026-09-25T10:25:14.368Z",
    "dateUpdated": "2026-10-30T12:39:26.925Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-98756",
      "date": "2026-11-01",
      "epss": "0.00176",
      "percentile": "0.07158"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-28T01:47:41.000Z",
      "cve": "CVE-2026-98756",
      "id": "msrc_CVE-2026-98756",
      "initial_release_date": "2026-10-20T01:08:39.000Z",
      "product_status:known_not_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: cdns3: Fix NULL pointer dereference in cdns3_pci_probe",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98756.json",
      "version": "4"
    },
    "nvd": {
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        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/usb/cdns3/cdns3-pci-wrap.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "6.1.191",
                    "versionType": "semver"
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                    "version": "6.6.160",
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                    "status": "unaffected",
                    "version": "6.12.113",
                    "versionType": "semver"
                  },
                  {
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                    "status": "unaffected",
                    "version": "6.18.56",
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                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.10",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
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                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: cdns3: Fix NULL pointer dereference in cdns3_pci_probe\n\nThe Cadence USBSS controller is a two-function PCI device. The first\nprobed function allocates the driver data and stores it with\npci_set_drvdata(), while the second function reuses it via\npci_get_drvdata() when pci_is_enabled() reports that the first\nfunction has already been probed.\n\nWhen the second function is probed while the first one has been\nenabled but has not yet set its driver data, pci_get_drvdata()\nreturns NULL, and the subsequent wrap-\u003edevfn assignment dereferences\na NULL pointer and crashes the kernel.\nlogs:\nCall trace:\n  cdns3_pci_probe+0xa4/0x300\n  local_pci_probe+0x44/0xa8\n  pci_call_probe+0x54/0x158\n  pci_device_probe+0x84/0x100\n  really_probe+0x184/0x3d0\n  __driver_probe_device+0x80/0x178\n  driver_probe_device+0x44/0xe8\n  __driver_attach+0xec/0x1f8\n  bus_for_each_dev+0x7c/0xe0\n  driver_attach+0x28/0x38\n  bus_add_driver+0x110/0x238\n  driver_register+0x64/0x128\n  __pci_register_driver+0x50/0x60\n  cdns3_pci_driver_init+0x28/0x38\n  do_one_initcall+0x5c/0x280\n  do_initcalls+0x104/0x1d8\n  kernel_init_freeable+0x140/0x218\n  kernel_init+0x28/0x1f8\n  ret_from_fork+0x10/0x20\n\nReturn -EPROBE_DEFER in this case so that probing is retried after\nthe first function has completed its probe."
          }
        ],
        "id": "CVE-2026-98756",
        "lastModified": "2026-10-30T13:21:25.080",
        "metrics": {},
        "published": "2026-10-18T16:17:29.397",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/399b18b18f54495eeeda8d88e039e6af27d020c9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/45b606418bae73c7cde9f0e57e5b0977c816a7c0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/549c04df02f1bb5a10342f32e2c87f5d27c97279"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/88b473800ae11397e2e169aff2e17b041c040409"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d16046f1ace2691b6a946f022fe6dc215936880b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dbdd0ca9a7eac140697a366f698a0e2bb02a06a1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e5052f2c5c73c1dcca42bafc0bc737af2b2af059"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fc13243658da9ed3c4c94aaff77c36a10f441b89"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-23T04:06:24+00:00",
      "cve": "CVE-2026-98756",
      "id": "CVE-2026-98756",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "77",
      "product_status:known_not_affected": "201",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: cdns3: Fix NULL pointer dereference in cdns3_pci_probe",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98756.json",
      "version": "3"
    }
  }
}



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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.
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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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    Related by attack behaviour

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