CVE-2025-40043

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40043", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.154Z", "datePublished": "2025-10-28T11:48:22.230Z", "dateUpdated": "2026-08-05T12:07:16.234Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:07:16.234Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nfc: nci: Add parameter validation for packet data\n\nSyzbot reported an uninitialized value bug in nci_init_req, which was\nintroduced by commit 5aca7966d2a7 (\"Merge tag\n'perf-tools-fixes-for-v6.17-2025-09-16' of\ngit://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools\").\n\nThis bug arises due to very limited and poor input validation\nthat was done at nic_valid_size(). This validation only\nvalidates the skb->len (directly reflects size provided at the\nuserspace interface) with the length provided in the buffer\nitself (interpreted as NCI_HEADER). This leads to the processing\nof memory content at the address assuming the correct layout\nper what opcode requires there. This leads to the accesses to\nbuffer of `skb_buff->data` which is not assigned anything yet.\n\nFollowing the same silent drop of packets of invalid sizes at\n`nic_valid_size()`, add validation of the data in the respective\nhandlers and return error values in case of failure. Release\nthe skb if error values are returned from handlers in\n`nci_nft_packet` and effectively do a silent drop\n\nPossible TODO: because we silently drop the packets, the\ncall to `nci_request` will be waiting for completion of request\nand will face timeouts. These timeouts can get excessively logged\nin the dmesg. A proper handling of them may require to export\n`nci_request_cancel` (or propagate error handling from the\nnft packets handlers)."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The parsed data is NCI notification payload whose RF-specific and activation parameters (ATS/RATS length byte, ATR_RES length, tech-specific params) originate from the contactless peer, so an attacker with a spoofed card or NFC emulator in proximity of a phone/POS/embedded reader supplies the malformed lengths. NFC proximity is Adjacent per kernel scoring guidance (a local unprivileged N_NCI-ldisc path also exists, but is strictly lower severity).\nAC:L - The attacker directly controls the length byte versus actual payload length and can present the malformed card/frame repeatedly until the target polls it; no race, no unpredictable memory-layout precondition is required.\nPR:N - No credentials or account on the target are needed \u2014 NFC polling activates and parses the notification automatically, and on the local variant `NCIUARTSETDRIVER` in nci_uart_tty_ioctl() has no capability check at all.\nUI:N - The NFC stack polls and processes discovery/activation notifications autonomously; the attacker brings the hostile device into range and the victim performs no action.\nS:U - The over-read, the write-back in the credits handler, and the leaked data all stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Tens of bytes past the payload \u2014 uninitialized slab tailroom and skb_shared_info, which holds kernel pointers \u2014 are copied into nfcid1/sens_res/ATS and exported to userspace via NFC netlink attributes, yielding stale-heap and kernel-pointer disclosure usable for KASLR defeat.\nI:H - `nci_core_conn_credits_ntf_packet()` writes masked bytes back into memory beyond the validated payload for up to 10 entries and adds an out-of-bounds byte into conn_info->credits_cnt, and unvalidated data populates ndev state (nci_ver, manufact_id, remote_gb, credits), giving attacker-shapeable kernel memory/state corruption.\nA:H - Out-of-bounds slab reads can hit a redzone/adjacent object and oops (KASAN/panic_on_oops), and the commit itself notes the resulting dropped packets leave nci_request() blocking until timeout with repeated dmesg flooding, degrading the NFC stack."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/nfc/nci/ntf.c"], "versions": [{"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "lessThan": "8fcc7315a10a84264e55bb65ede10f0af20a983f", "status": "affected", "versionType": "git"}, {"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "lessThan": "bfdda0123dde406dbff62e7e9136037e97998a15", "status": "affected", "versionType": "git"}, {"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "lessThan": "0ba68bea1e356f466ad29449938bea12f5f3711f", "status": "affected", "versionType": "git"}, {"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "lessThan": "74837bca0748763a77f77db47a0bdbe63b347628", "status": "affected", "versionType": "git"}, {"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "lessThan": "c395d1e548cc68e84584ffa2e3ca9796a78bf7b9", "status": "affected", "versionType": "git"}, {"version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "lessThan": "9c328f54741bd5465ca1dc717c84c04242fac2e1", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/nfc/nci/ntf.c"], "versions": [{"version": "3.2", "status": "affected"}, {"version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.195", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.156", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.112", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.53", "lessThanOrEqual": "6.12.*", "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": "3.2", "versionEndExcluding": "5.15.195"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.156"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.6.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.12.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.17.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8fcc7315a10a84264e55bb65ede10f0af20a983f"}, {"url": "https://git.kernel.org/stable/c/bfdda0123dde406dbff62e7e9136037e97998a15"}, {"url": "https://git.kernel.org/stable/c/0ba68bea1e356f466ad29449938bea12f5f3711f"}, {"url": "https://git.kernel.org/stable/c/74837bca0748763a77f77db47a0bdbe63b347628"}, {"url": "https://git.kernel.org/stable/c/c395d1e548cc68e84584ffa2e3ca9796a78bf7b9"}, {"url": "https://git.kernel.org/stable/c/9c328f54741bd5465ca1dc717c84c04242fac2e1"}], "title": "net: nfc: nci: Add parameter validation for packet data", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/nfc/nci/ntf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8fcc7315a10a84264e55bb65ede10f0af20a983f", "status": "affected", "version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "versionType": "git"}, {"lessThan": "bfdda0123dde406dbff62e7e9136037e97998a15", "status": "affected", "version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "versionType": "git"}, {"lessThan": "0ba68bea1e356f466ad29449938bea12f5f3711f", "status": "affected", "version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "versionType": "git"}, {"lessThan": "74837bca0748763a77f77db47a0bdbe63b347628", "status": "affected", "version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "versionType": "git"}, {"lessThan": "c395d1e548cc68e84584ffa2e3ca9796a78bf7b9", "status": "affected", "version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "versionType": "git"}, {"lessThan": "9c328f54741bd5465ca1dc717c84c04242fac2e1", "status": "affected", "version": "6a2968aaf50c7a22fced77a5e24aa636281efca8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/nfc/nci/ntf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.2"}, {"lessThan": "3.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.195", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.156", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.112", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.53", "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\nnet: nfc: nci: Add parameter validation for packet data\n\nSyzbot reported an uninitialized value bug in nci_init_req, which was\nintroduced by commit 5aca7966d2a7 (\"Merge tag\n'perf-tools-fixes-for-v6.17-2025-09-16' of\ngit://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools\").\n\nThis bug arises due to very limited and poor input validation\nthat was done at nic_valid_size(). This validation only\nvalidates the skb->len (directly reflects size provided at the\nuserspace interface) with the length provided in the buffer\nitself (interpreted as NCI_HEADER). This leads to the processing\nof memory content at the address assuming the correct layout\nper what opcode requires there. This leads to the accesses to\nbuffer of `skb_buff->data` which is not assigned anything yet.\n\nFollowing the same silent drop of packets of invalid sizes at\n`nic_valid_size()`, add validation of the data in the respective\nhandlers and return error values in case of failure. Release\nthe skb if error values are returned from handlers in\n`nci_nft_packet` and effectively do a silent drop\n\nPossible TODO: because we silently drop the packets, the\ncall to `nci_request` will be waiting for completion of request\nand will face timeouts. These timeouts can get excessively logged\nin the dmesg. A proper handling of them may require to export\n`nci_request_cancel` (or propagate error handling from the\nnft packets handlers)."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: nfc: nci: A\u00f1adir validaci\u00f3n de par\u00e1metros para datos de paquete\n\nSyzbot inform\u00f3 un error de valor no inicializado en nci_init_req, que fue introducido por el commit 5aca7966d2a7 ('Fusionar etiqueta 'perf-tools-fixes-for-v6.17-2025-09-16' de git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools').\n\nEste error surge debido a una validaci\u00f3n de entrada muy limitada y deficiente que se realiz\u00f3 en nic_valid_size(). Esta validaci\u00f3n solo valida el skb->len (refleja directamente el tama\u00f1o proporcionado en la interfaz de espacio de usuario) con la longitud proporcionada en el propio b\u00fafer (interpretada como NCI_HEADER). Esto lleva al procesamiento de contenido de memoria en la direcci\u00f3n asumiendo el dise\u00f1o correcto seg\u00fan lo que el c\u00f3digo de operaci\u00f3n requiere all\u00ed. Esto lleva a los accesos al b\u00fafer de 'skb_buff->data' al que a\u00fan no se le ha asignado nada.\n\nSiguiendo la misma ca\u00edda silenciosa de paquetes de tama\u00f1os inv\u00e1lidos en 'nic_valid_size()', a\u00f1adir validaci\u00f3n de los datos en los manejadores respectivos y devolver valores de error en caso de fallo. Liberar el skb si se devuelven valores de error de los manejadores en 'nci_nft_packet' y realizar efectivamente una ca\u00edda silenciosa.\n\nPosible PENDIENTE: debido a que descartamos silenciosamente los paquetes, la llamada a 'nci_request' estar\u00e1 esperando la finalizaci\u00f3n de la solicitud y se enfrentar\u00e1 a tiempos de espera. Estos tiempos de espera pueden ser registrados excesivamente en el dmesg. Un manejo adecuado de ellos puede requerir exportar 'nci_request_cancel' (o propagar el manejo de errores desde los manejadores de paquetes nft)."}], "id": "CVE-2025-40043", "lastModified": "2026-10-19T21:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2025-10-28T12:15:38.333", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0ba68bea1e356f466ad29449938bea12f5f3711f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/74837bca0748763a77f77db47a0bdbe63b347628"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8fcc7315a10a84264e55bb65ede10f0af20a983f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9c328f54741bd5465ca1dc717c84c04242fac2e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bfdda0123dde406dbff62e7e9136037e97998a15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c395d1e548cc68e84584ffa2e3ca9796a78bf7b9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: net: nfc: nci: Add parameter validation for packet data", "id": "2406754", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2406754"}, "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": ["No description is available for this CVE."], "name": "CVE-2025-40043", "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": "2025-10-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40043\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40043\nhttps://lore.kernel.org/linux-cve-announce/2025102813-CVE-2025-40043-39d2@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-29T10:58:15.616391+00:00", "updated": "2025-10-29T10:58:15.616442+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}