{"api_version":"1","generated_at":"2026-04-23T15:11:12+00:00","cve":"CVE-2026-23274","urls":{"html":"https://cve.report/CVE-2026-23274","api":"https://cve.report/api/cve/CVE-2026-23274.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-23274","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-23274"},"summary":{"title":"netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels\n\nIDLETIMER revision 0 rules reuse existing timers by label and always call\nmod_timer() on timer->timer.\n\nIf the label was created first by revision 1 with XT_IDLETIMER_ALARM,\nthe object uses alarm timer semantics and timer->timer is never initialized.\nReusing that object from revision 0 causes mod_timer() on an uninitialized\ntimer_list, triggering debugobjects warnings and possible panic when\npanic_on_warn=1.\n\nFix this by rejecting revision 0 rule insertion when an existing timer with\nthe same label is of ALARM type.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-03-20 09:16:13","updated_at":"2026-04-18 09:16:15"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","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"}},{"version":"3.1","source":"CNA","type":"DECLARED","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":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491","name":"https://git.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309","name":"https://git.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/144f88054ba0180467356f40895bd660b5dceeec","name":"https://git.kernel.org/stable/c/144f88054ba0180467356f40895bd660b5dceeec","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1","name":"https://git.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9","name":"https://git.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44","name":"https://git.kernel.org/stable/c/32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf","name":"https://git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9","name":"https://git.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23274","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23274","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 68983a354a655c35d3fb204489d383a2a051fda7 32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 68983a354a655c35d3fb204489d383a2a051fda7 144f88054ba0180467356f40895bd660b5dceeec git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 68983a354a655c35d3fb204489d383a2a051fda7 28c7cfaf0c0ab17cbd7754092116fd1af45271f9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 68983a354a655c35d3fb204489d383a2a051fda7 54080355999381fed4a26129579a5765bab87491 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels\n\nIDLETIMER revision 0 rules reuse existing timers by label and always call\nmod_timer() on timer->timer.\n\nIf the label was created first by revision 1 with XT_IDLETIMER_ALARM,\nthe object uses alarm timer semantics and timer->timer is never initialized.\nReusing that object from revision 0 causes mod_timer() on an uninitialized\ntimer_list, triggering debugobjects warnings and possible panic when\npanic_on_warn=1.\n\nFix this by rejecting revision 0 rule insertion when an existing timer with\nthe same label is of ALARM type."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-04-18T08:57:32.534Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44"},{"url":"https://git.kernel.org/stable/c/144f88054ba0180467356f40895bd660b5dceeec"},{"url":"https://git.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9"},{"url":"https://git.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491"},{"url":"https://git.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9"},{"url":"https://git.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1"},{"url":"https://git.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309"},{"url":"https://git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf"}],"title":"netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-23274","datePublished":"2026-03-20T08:08:54.918Z","dateReserved":"2026-01-13T15:37:45.991Z","dateUpdated":"2026-04-18T08:57:32.534Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-03-20 09:16:13","lastModifiedDate":"2026-04-18 09:16:15","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","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":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"23274","Ordinal":"1","Title":"netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels","CVE":"CVE-2026-23274","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"23274","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels\n\nIDLETIMER revision 0 rules reuse existing timers by label and always call\nmod_timer() on timer->timer.\n\nIf the label was created first by revision 1 with XT_IDLETIMER_ALARM,\nthe object uses alarm timer semantics and timer->timer is never initialized.\nReusing that object from revision 0 causes mod_timer() on an uninitialized\ntimer_list, triggering debugobjects warnings and possible panic when\npanic_on_warn=1.\n\nFix this by rejecting revision 0 rule insertion when an existing timer with\nthe same label is of ALARM type.","Type":"Description","Title":"netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels"}]}}}