CVE-2026-31629

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This results in a double release_sock()\nand a refcount underflow via double nfc_llcp_sock_put(), leading to\na use-after-free.\n\nAdd the missing return statements after the LLCP_CLOSED branches\nin both functions to prevent the fall-through."}], "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 vulnerable LLCP receive handlers process NFC DEP/LLCP PDUs supplied by a nearby NFC peer over the NFC radio link. The attacker must be in NFC range, so this is adjacent rather than local or internet-routable network access.\nAC:L - The attacker can drive the required LLCP packet sequence, for example closing a matched LLCP socket with a remote control PDU and then sending DISC or I/RR/RNR for the same SAP pair. No uncontrollable race or special memory layout condition is required to trigger the double put/unlock path.\nPR:N - The triggering input is unauthenticated NFC LLCP traffic from the peer and does not require an account or privileges on the victim. Any local NFC setup or listening service is an environmental prerequisite, not a privilege held by the attacker.\nUI:N - After the victim NFC subsystem/link is active and the attacker is in range, malicious LLCP frames are processed by the kernel receive path without further victim action. Proximity is already captured by AV:A.\nS:U - The vulnerability corrupts kernel socket lifetime state within the same kernel security authority. It does not cross a VM, hypervisor, IOMMU, or separate authorization boundary.\nC:H - The bug causes a refcount imbalance and use-after-free of an NFC LLCP socket object. Kernel UAFs are defensibly treated as enabling memory disclosure primitives under the required high-severity guidance.\nI:H - The freed socket object can potentially be reclaimed and controlled, turning the UAF into kernel memory corruption or control-flow/data-structure modification. Under the required guidance, UAF impact is high for integrity.\nA:H - The double release and double sock_put can produce refcount underflow, use-after-free, warnings, oopses, or crashes in kernel socket handling. A kernel crash or panic is high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/nfc/llcp_core.c"], "versions": [{"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "b2a23529593d011fb433a3d711fc597ed6a6bd2f", "status": "affected", "versionType": "git"}, {"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "665315df9c3486cb213fc44d83cc8bcd47fe0d26", "status": "affected", "versionType": "git"}, {"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6", "status": "affected", "versionType": "git"}, {"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": "0eb1263a3b8c36418c9ba295c9ab3abed664edbf", "status": "affected", "versionType": "git"}, {"version": "d646960f7986fefb460a2b062d5ccc8ccfeacc3a", "lessThan": 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Execution falls through to\nthe remainder of the function, which calls release_sock() and\nnfc_llcp_sock_put() again. This results in a double release_sock()\nand a refcount underflow via double nfc_llcp_sock_put(), leading to\na use-after-free.\n\nAdd the missing return statements after the LLCP_CLOSED branches\nin both functions to prevent the fall-through."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnfc: llcp: a\u00f1adir retorno faltante despu\u00e9s de las comprobaciones de LLCP_CLOSED\n\nEn nfc_llcp_recv_hdlc() y nfc_llcp_recv_disc(), cuando el estado del socket es LLCP_CLOSED, el c\u00f3digo llama correctamente a release_sock() y nfc_llcp_sock_put() pero no retorna. La ejecuci\u00f3n contin\u00faa hacia el resto de la funci\u00f3n, que llama a release_sock() y nfc_llcp_sock_put() de nuevo. Esto resulta en una doble llamada a release_sock() y un subdesbordamiento del contador de referencias a trav\u00e9s de una doble llamada a nfc_llcp_sock_put(), lo que lleva a un uso despu\u00e9s de liberaci\u00f3n.\n\nA\u00f1adir las sentencias \u2019return\u2019 faltantes despu\u00e9s de las ramas LLCP_CLOSED en ambas funciones para evitar el paso directo."}], "id": "CVE-2026-31629", "lastModified": "2026-11-11T23:10:00.263", "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": "2026-04-24T15:16:42.217", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0eb1263a3b8c36418c9ba295c9ab3abed664edbf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b5dd4632966c39da6ba74dbc8689b309065e82c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/665315df9c3486cb213fc44d83cc8bcd47fe0d26"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/796e0cac058252d0ad34ebe288e6f7979b5fc9b2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8977fad2b3c6eefd414131168d597c5d1d5e1abf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9b49e2a4b8219a2fc5cebf94f4ec34e509aff8a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/aba4712e8f0381cd5d196534ce2ad082626a5ab6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b2a23529593d011fb433a3d711fc597ed6a6bd2f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ff3d9e8f7244293e303f7b6ef70774291c7c27e9"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: nfc: llcp: add missing return after LLCP_CLOSED checks", "id": "2461553", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2461553"}, "csaw": false, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's Near Field Communication (NFC) Logical Link Control Protocol (LLCP) subsystem. Missing return statements after LLCP_CLOSED checks in the nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc() functions can lead to a use-after-free vulnerability. This occurs because the system attempts to release resources twice, causing a reference count underflow. An attacker could potentially exploit this to cause a denial of service or other system instability."], "name": "CVE-2026-31629", "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": "2026-04-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31629\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31629\nhttps://lore.kernel.org/linux-cve-announce/2026042428-CVE-2026-31629-84ab@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d646960f7986fefb460a2b062d5ccc8ccfeacc3a,0eb1263a3b8c36418c9ba295c9ab3abed664edbf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d646960f7986fefb460a2b062d5ccc8ccfeacc3a,796e0cac058252d0ad34ebe288e6f7979b5fc9b2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d646960f7986fefb460a2b062d5ccc8ccfeacc3a,8977fad2b3c6eefd414131168d597c5d1d5e1abf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d646960f7986fefb460a2b062d5ccc8ccfeacc3a,ff3d9e8f7244293e303f7b6ef70774291c7c27e9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d646960f7986fefb460a2b062d5ccc8ccfeacc3a,aba4712e8f0381cd5d196534ce2ad082626a5ab6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d646960f7986fefb460a2b062d5ccc8ccfeacc3a,2b5dd4632966c39da6ba74dbc8689b309065e82c)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.3"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.3)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.136,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.83,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.24,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.14,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.1,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1-rc1,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-04-28T13:55:32.768205+00:00", "value": {"mitigation_remediation": ["Update the Linux kernel to a version that incorporates the patch adding the missing returns to nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc().", "If an immediate kernel upgrade is not possible, disable NFC LLCP services or block NFC traffic to eliminate the code paths that can trigger the double release.", "After updating or disabling the service, monitor system logs for any indications of kernel panics or use\u2011after\u2011free errors to verify that the issue no longer occurs."], "summary": {"action": "Patch immediately", "impact": "Use-after-Free"}, "threat_synthesis": {"affected_systems": "The vulnerability affects all Linux kernel builds that include the buggy nfc_llcp_recv_hdlc() and nfc_llcp_recv_disc() functions. Any distribution that has not applied the patch commit adding the missing return statements remains vulnerable. The issue is present in the mainline kernel source before the upstream fix.", "description_and_impact": "In the Linux kernel's NFC LLCP implementation, two functions incorrectly fall through after handling a closed socket state. The code calls release_sock() and nfc_llcp_sock_put() twice, causing a reference count underflow and a use\u2011after\u2011free. This memory corruption can allow an attacker to execute arbitrary code or crash the system if the double release is triggered during normal operation.", "risk_and_exploitability": "The CVSS score of 8.8 indicates high severity, but the EPSS score of less than 1% shows a low probability of real\u2011world exploitation. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Based on the code path, the attack likely requires local or privileged access to trigger the double release; remote exploitation would need a vector that can manipulate NFC LLCP traffic against the target kernel."}}}}, "created": "2026-04-27T18:45:11.326007+00:00", "updated": "2026-04-28T14:00:16.506075+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}