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

Vulnerability from cvelistv5 – Published: 2025-11-12 10:23 – Updated: 2026-08-05 12:07
VLAI
Title
misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()
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().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: eefb83790a0dda112d1755e4f5e213738d717e76 , < 6df3687922570f753574c40b35e83b26b32292d0 (git)
Affected: eefb83790a0dda112d1755e4f5e213738d717e76 , < 1ad82f9db13d85667366044acdfb02009d576c5a (git)
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Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "programFiles": [
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        }
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              "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."
            }
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    "datePublished": "2025-11-12T10:23:17.851Z",
    "dateReserved": "2025-04-16T07:20:57.168Z",
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            "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()."
          }
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        "lastModified": "2026-07-30T06:24:12.380",
        "metrics": {
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      "id": "CVE-2025-40117",
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40117.json",
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}



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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.