{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31696",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.131Z",
        "datePublished": "2026-05-01T13:55:57.485Z",
        "dateUpdated": "2026-10-15T01:17:54.785Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-14T17:43:27.449Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix missing validation of ticket length in non-XDR key preparsing\n\nIn rxrpc_preparse(), there are two paths for parsing key payloads: the\nXDR path (for large payloads) and the non-XDR path (for payloads <= 28\nbytes). While the XDR path (rxrpc_preparse_xdr_rxkad()) correctly\nvalidates the ticket length against AFSTOKEN_RK_TIX_MAX, the non-XDR\npath fails to do so.\n\nThis allows an unprivileged user to provide a very large ticket length.\nWhen this key is later read via rxrpc_read(), the total\ntoken size (toksize) calculation results in a value that exceeds\nAFSTOKEN_LENGTH_MAX, triggering a WARN_ON().\n\n[ 2001.302904] WARNING: CPU: 2 PID: 2108 at net/rxrpc/key.c:778 rxrpc_read+0x109/0x5c0 [rxrpc]\n\nFix this by adding a check in the non-XDR parsing path of rxrpc_preparse()\nto ensure the ticket length does not exceed AFSTOKEN_RK_TIX_MAX,\nbringing it into parity with the XDR parsing logic."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/rxrpc/key.c"
                    ],
                    "versions": [
                        {
                            "version": "8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247",
                            "lessThan": "44714dfda386884919ba366411880b6fb3c3efd3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247",
                            "lessThan": "41a117dd80371343babc52198d1114e83eb37627",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247",
                            "lessThan": "9a397aa9b5e53ca63d4d6aefb542832eca389618",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247",
                            "lessThan": "1fa36cf495b0023e8475d038535c05e4063211e1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247",
                            "lessThan": "4458757c020592a3094366e0fb20457383b42f92",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247",
                            "lessThan": "ce383ba615339f8eaec646a166d2c2b015bb5ca0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247",
                            "lessThan": "a1be1c9ece26cea69654f28b255ff9a7906b897b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8a7a3eb4ddbe7c7e639170a64adede7cbd5a9247",
                            "lessThan": "ac33733b10b484d666f97688561670afd5861383",
                            "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/rxrpc/key.c"
                    ],
                    "versions": [
                        {
                            "version": "3.17",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.17",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.258",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.209",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.175",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.136",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.84",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.25",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.2",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "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": "3.17",
                                    "versionEndExcluding": "5.10.258"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "5.15.209"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "6.1.175"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "6.6.136"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "6.12.84"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "6.18.25"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "7.0.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.17",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/44714dfda386884919ba366411880b6fb3c3efd3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/41a117dd80371343babc52198d1114e83eb37627"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9a397aa9b5e53ca63d4d6aefb542832eca389618"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1fa36cf495b0023e8475d038535c05e4063211e1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4458757c020592a3094366e0fb20457383b42f92"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ce383ba615339f8eaec646a166d2c2b015bb5ca0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a1be1c9ece26cea69654f28b255ff9a7906b897b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ac33733b10b484d666f97688561670afd5861383"
                }
            ],
            "title": "rxrpc: Fix missing validation of ticket length in non-XDR key preparsing",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        },
        "adp": [
            {
                "x_adpType": "supplier",
                "providerMetadata": {
                    "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
                    "shortName": "siemens-SADP",
                    "dateUpdated": "2026-10-15T01:17:54.785Z"
                },
                "affected": [
                    {
                        "vendor": "Siemens",
                        "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
                        "versions": [
                            {
                                "status": "affected",
                                "version": "0",
                                "lessThan": "*",
                                "versionType": "custom"
                            }
                        ],
                        "defaultStatus": "unknown"
                    }
                ],
                "references": [
                    {
                        "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
                    }
                ]
            }
        ]
    }
}