{"api_version":"1","generated_at":"2026-05-13T07:41:43+00:00","cve":"CVE-2026-31696","urls":{"html":"https://cve.report/CVE-2026-31696","api":"https://cve.report/api/cve/CVE-2026-31696.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31696","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31696"},"summary":{"title":"rxrpc: Fix missing validation of ticket length in non-XDR key preparsing","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 14:16:19","updated_at":"2026-05-06 19:17:41"},"problem_types":["CWE-787"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/4458757c020592a3094366e0fb20457383b42f92","name":"https://git.kernel.org/stable/c/4458757c020592a3094366e0fb20457383b42f92","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ce383ba615339f8eaec646a166d2c2b015bb5ca0","name":"https://git.kernel.org/stable/c/ce383ba615339f8eaec646a166d2c2b015bb5ca0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1fa36cf495b0023e8475d038535c05e4063211e1","name":"https://git.kernel.org/stable/c/1fa36cf495b0023e8475d038535c05e4063211e1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a1be1c9ece26cea69654f28b255ff9a7906b897b","name":"https://git.kernel.org/stable/c/a1be1c9ece26cea69654f28b255ff9a7906b897b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ac33733b10b484d666f97688561670afd5861383","name":"https://git.kernel.org/stable/c/ac33733b10b484d666f97688561670afd5861383","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31696","name":"CVE 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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."}],"providerMetadata":{"dateUpdated":"2026-05-01T13:55:57.485Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31696","datePublished":"2026-05-01T13:55:57.485Z","dateReserved":"2026-03-09T15:48:24.131Z","dateUpdated":"2026-05-01T13:55:57.485Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-01 14:16:19","lastModifiedDate":"2026-05-06 19:17:41","problem_types":["CWE-787"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.6.136","matchCriteriaId":"C73D2808-65F0-4CE5-A194-0FCDE4D23BFC"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.84","matchCriteriaId":"D4ECA0DE-AFF5-4688-B219-4CA2336CA5B7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.25","matchCriteriaId":"8B0A7E0E-F6D8-45DB-8CD9-01839FE40A6C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0.2","matchCriteriaId":"1BD58F1E-7C20-4C0D-92A2-FAC5CBFBE8A8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*","matchCriteriaId":"B1EF7059-E670-45F4-B422-54C40FA86390"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*","matchCriteriaId":"0D38F0BF-A728-4133-A358-D44A2F7EE6D6"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31696","Ordinal":"1","Title":"rxrpc: Fix missing validation of ticket length in non-XDR key pr","CVE":"CVE-2026-31696","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31696","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"rxrpc: Fix missing validation of ticket length in non-XDR key pr"}]}}}