{"id":"CVE-2026-23274","revision":null,"records":[{"revision":"6317b408e57047a8aae2641a5f49d103","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-23274","aliases":[],"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":0,"publishedAt":"2026-03-20T08:08:54.918+00:00","modifiedAt":"2026-10-19T18:35:41.155+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/xt_IDLETIMER.c\"\n ],\n \"versions\": [\n {\n \"version\": \"68983a354a655c35d3fb204489d383a2a051fda7\",\n \"lessThan\": \"32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"68983a354a655c35d3fb204489d383a2a051fda7\",\n \"lessThan\": \"144f88054ba0180467356f40895bd660b5dceeec\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"68983a354a655c35d3fb204489d383a2a051fda7\",\n \"lessThan\": \"28c7cfaf0c0ab17cbd7754092116fd1af45271f9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"68983a354a655c35d3fb204489d383a2a051fda7\",\n \"lessThan\": \"54080355999381fed4a26129579a5765bab87491\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"68983a354a655c35d3fb204489d383a2a051fda7\",\n \"lessThan\": \"5e7ece24c5cb75a60402aad4d803c7898ea40aa9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"68983a354a655c35d3fb204489d383a2a051fda7\",\n \"lessThan\": \"f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"68983a354a655c35d3fb204489d383a2a051fda7\",\n \"lessThan\": \"f228b9ae2a7e84d1153616d8e71c4236cb1f1309\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"68983a354a655c35d3fb204489d383a2a051fda7\",\n \"lessThan\": \"329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/netfilter/xt_IDLETIMER.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.7\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.7\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.253\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.203\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.167\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.130\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.78\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.19\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19.9\",\n \"lessThanOrEqual\": \"6.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/32e937dc6e97f5ed3cdfe3fc0b2b19a05e23fa44","https://git.kernel.org/stable/c/144f88054ba0180467356f40895bd660b5dceeec","https://git.kernel.org/stable/c/28c7cfaf0c0ab17cbd7754092116fd1af45271f9","https://git.kernel.org/stable/c/54080355999381fed4a26129579a5765bab87491","https://git.kernel.org/stable/c/5e7ece24c5cb75a60402aad4d803c7898ea40aa9","https://git.kernel.org/stable/c/f5ef97c13165542480a6ffdbe6f09f40bbb7cbf1","https://git.kernel.org/stable/c/f228b9ae2a7e84d1153616d8e71c4236cb1f1309","https://git.kernel.org/stable/c/329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-23274","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-23274","identifiers":["CVE-2026-23274"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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