CVE-2025-40117

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40117", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.168Z", "datePublished": "2025-11-12T10:23:17.851Z", "dateUpdated": "2026-08-05T12:07:53.958Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:07:53.958Z"}, "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": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "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 > BAR_5` check; there is no race, no timing window, and no dependence on state outside the attacker's 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->resource[]`, 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->bar[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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/pci_endpoint_test.c"], "versions": [{"version": "eefb83790a0dda112d1755e4f5e213738d717e76", "lessThan": "6df3687922570f753574c40b35e83b26b32292d0", "status": "affected", "versionType": "git"}, {"version": "eefb83790a0dda112d1755e4f5e213738d717e76", "lessThan": "1ad82f9db13d85667366044acdfb02009d576c5a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/pci_endpoint_test.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.3", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.17.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.18"}]}]}], "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"}}}}

{}

{"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"}

{"bugzilla": {"description": "kernel: misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()", "id": "2414502", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2414502"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmisc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl()\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()."], "name": "CVE-2025-40117", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-11-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40117\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40117\nhttps://lore.kernel.org/linux-cve-announce/2025111251-CVE-2025-40117-82a4@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-11-12T22:12:38.993682+00:00", "updated": "2025-11-12T22:12:38.993708+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}