Vulnerability-Lookup

FKIE_CVE-2025-40117

Vulnerability from fkie_nvd - Published: 2025-11-12 11:15 - Updated: 2026-10-19 21:10

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl() Commit eefb83790a0d ("misc: pci_endpoint_test: Add doorbell test case") added NO_BAR (-1) to the pci_barno enum which, in practical terms, changes the enum from an unsigned int to a signed int. If the user passes a negative number in pci_endpoint_test_ioctl() then it results in an array underflow in pci_endpoint_test_bar().

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1ad82f9db13d85667366044acdfb02009d576c5a
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6df3687922570f753574c40b35e83b26b32292d0

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/pci_endpoint_test.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6df3687922570f753574c40b35e83b26b32292d0",
              "status": "affected",
              "version": "eefb83790a0dda112d1755e4f5e213738d717e76",
              "versionType": "git"
            },
            {
              "lessThan": "1ad82f9db13d85667366044acdfb02009d576c5a",
              "status": "affected",
              "version": "eefb83790a0dda112d1755e4f5e213738d717e76",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/pci_endpoint_test.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "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\nmisc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()\n\nCommit eefb83790a0d (\"misc: pci_endpoint_test: Add doorbell test case\")\nadded NO_BAR (-1) to the pci_barno enum which, in practical terms,\nchanges the enum from an unsigned int to a signed int.  If the user\npasses a negative number in pci_endpoint_test_ioctl() then it results in\nan array underflow in pci_endpoint_test_bar()."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmisc: pci_endpoint_test: Correcci\u00f3n de subdesbordamiento de array en pci_endpoint_test_ioctl()\n\nEl commit eefb83790a0d (\u201cmisc: pci_endpoint_test: Add doorbell test case\u201d) a\u00f1adi\u00f3 NO_BAR (-1) al enum pci_barno, lo que, en t\u00e9rminos pr\u00e1cticos, cambia el enum de un entero sin signo a un entero con signo. Si el usuario pasa un n\u00famero negativo en pci_endpoint_test_ioctl(), entonces provoca un subdesbordamiento de array en pci_endpoint_test_bar()."
    }
  ],
  "id": "CVE-2025-40117",
  "lastModified": "2026-10-19T21:10:00.160",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-11-12T11:15:41.003",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1ad82f9db13d85667366044acdfb02009d576c5a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6df3687922570f753574c40b35e83b26b32292d0"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}

CVE-2025-40117 (GCVE-0-2025-40117)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-08-05 12:07

Title

misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6843 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/6df3687922570f753…
https://git.kernel.org/stable/c/1ad82f9db13d85667…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: eefb83790a0dda112d1755e4f5e213738d717e76 , < 6df3687922570f753574c40b35e83b26b32292d0 (git) Affected: eefb83790a0dda112d1755e4f5e213738d717e76 , < 1ad82f9db13d85667366044acdfb02009d576c5a (git)
Linux	Linux	Affected: 6.17 Unaffected: 0 , < 6.17 (semver) Unaffected: 6.17.3 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/pci_endpoint_test.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6df3687922570f753574c40b35e83b26b32292d0",
              "status": "affected",
              "version": "eefb83790a0dda112d1755e4f5e213738d717e76",
              "versionType": "git"
            },
            {
              "lessThan": "1ad82f9db13d85667366044acdfb02009d576c5a",
              "status": "affected",
              "version": "eefb83790a0dda112d1755e4f5e213738d717e76",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/pci_endpoint_test.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.3",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()\n\nCommit eefb83790a0d (\"misc: pci_endpoint_test: Add doorbell test case\")\nadded NO_BAR (-1) to the pci_barno enum which, in practical terms,\nchanges the enum from an unsigned int to a signed int.  If the user\npasses a negative number in pci_endpoint_test_ioctl() then it results in\nan array underflow in pci_endpoint_test_bar()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is triggered by a PCITEST_BAR ioctl on the local misc device /dev/pci-endpoint-test.N, requiring local system access rather than any network or physical interaction.\nAC:L - A single ioctl with any negative argument deterministically defeats the signed `bar \u003e BAR_5` check; there is no race, no timing window, and no dependence on state outside the attacker\u0027s control.\nPR:L - The driver performs no capability check at all \u2014 no CAP_SYS_ADMIN, no .open hook, nothing \u2014 so any local user holding a descriptor to the test device node can trigger it, and on the PCI-endpoint test rigs where this driver is deployed the node is commonly exposed to the non-root test-automation account.\nUI:N - The attacker performs the entire attack via its own ioctl call; no victim action or cooperation is needed.\nS:U - The out-of-bounds accesses corrupt kernel memory and MMIO mappings within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The attacker-controlled negative index produces out-of-bounds reads of `pdev-\u003eresource[]`, of `struct pci_endpoint_test`, of `.rodata`, and a `memcpy_fromio()` of up to 1 MB from an OOB-derived pointer, and the resulting memory-corruption primitive can be leveraged for arbitrary kernel memory disclosure.\nI:H - `memcpy_toio(test-\u003ebar[barno] + offset, ...)` writes megabytes of pattern data to a destination pointer read from out-of-bounds memory at an attacker-chosen index, clobbering kernel heap objects (including `struct pci_dev`) or adjacent device MMIO registers \u2014 an arbitrary-write primitive exploitable for control-flow hijacking.\nA:H - The loop bound comes from a garbage `bar_size` read out of bounds, so the write runs far past any valid mapping and reliably faults, and the heap corruption itself guarantees a kernel oops or panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:07:53.958Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6df3687922570f753574c40b35e83b26b32292d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ad82f9db13d85667366044acdfb02009d576c5a"
        }
      ],
      "title": "misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40117",
    "datePublished": "2025-11-12T10:23:17.851Z",
    "dateReserved": "2025-04-16T07:20:57.168Z",
    "dateUpdated": "2026-08-05T12:07:53.958Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

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