{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74636","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.922Z","datePublished":"2026-08-22T15:32:16.026Z","dateUpdated":"2026-08-22T15:32:16.026Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-22T15:32:16.026Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Fix race between update_event_fields and, event_define_fields\n\nThe following sequence may leads race between event_define_fields()\nand update_event_fields():\n\n CPU0 (loads module A)                      CPU1 (loads module B)\n ===============================            ===============================\n load_module(A)                             load_module(B)\n   notifier_call_chain                        notifier_call_chain\n     trace_module_notify                        trace_module_notify\n       mutex_lock(&event_mutex)                   trace_event_update_all()\n         trace_module_add_events(A)                 down_write(&trace_event_sem)\n            __register_event(call_A)\n              __add_event_to_tracers(call_A)\n                event_define_fields(call_A)\n                  for each f:                         list_for_each_entry(field,\n                    list_add(&f->link,                                    &class->fields, link)\n                             &class->fields)            field = class->fields->next;\n\nWhere access to the class->fields is not protected by the event_mutex in\ntrace_event_update_all().\n\nThis produces the following panic:\n   Unable to handle kernel access ... at virtual address 0000000000000018\n   pc : update_event_fields+0xf8/0x368\n   Call trace:\n    update_event_fields+0xf8/0x368\n    trace_event_update_all+0x7c/0x2b4\n    trace_module_notify+0x4c/0x1dc\n    notifier_call_chain+0x84/0x168\n    blocking_notifier_call_chain_robust+0x64/0xd4\n    load_module+0x10c8/0x123c\n    __arm64_sys_finit_module+0x230/0x31c\n\nFix by taking event_mutex in trace_event_update_all() before\ntrace_event_sem."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_events.c"],"versions":[{"version":"7c6bd60999f32138e3b73fd97ea11ef47a94de25","lessThan":"4e39f7b4d9d36508c53e89e6cbc640728df870b5","status":"affected","versionType":"git"},{"version":"b3bc8547d3be60898818885f5bf22d0a62e2eb48","lessThan":"a30d421468300b1e7b2f233136aeb2db8013f555","status":"affected","versionType":"git"},{"version":"b3bc8547d3be60898818885f5bf22d0a62e2eb48","lessThan":"e5f1d301b4bdaa4206db251fdc691f623162b0a8","status":"affected","versionType":"git"},{"version":"b3bc8547d3be60898818885f5bf22d0a62e2eb48","lessThan":"fdeb190b0905a6aaed1e5d6adfb8613214748d7d","status":"affected","versionType":"git"},{"version":"b3bc8547d3be60898818885f5bf22d0a62e2eb48","lessThan":"ed49684e69f846bf50b5050651ccdb87cfd152c0","status":"affected","versionType":"git"},{"version":"b3bc8547d3be60898818885f5bf22d0a62e2eb48","lessThan":"f128740f39ab28d1f4ad5bdd10f3e117eec0c374","status":"affected","versionType":"git"},{"version":"b3bc8547d3be60898818885f5bf22d0a62e2eb48","lessThan":"c3730b8373bb5059d735509b9e6a00d7eb337d7c","status":"affected","versionType":"git"},{"version":"55defdf935fab9f2989a197aae1042c082d9a343","status":"affected","versionType":"git"},{"version":"0c53a5c80e6e286733381a1d9f255ba4039e2e45","status":"affected","versionType":"git"},{"version":"5.15.33","lessThan":"5.15.216","status":"affected","versionType":"semver"},{"version":"5.16.19","lessThan":"5.17","status":"affected","versionType":"semver"},{"version":"5.17.2","lessThan":"5.18","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/trace/trace_events.c"],"versions":[{"version":"5.18","status":"affected"},{"version":"0","lessThan":"5.18","status":"unaffected","versionType":"semver"},{"version":"5.15.216","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.183","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.152","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.104","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.45","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.9","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","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":"5.15.33","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.6.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4e39f7b4d9d36508c53e89e6cbc640728df870b5"},{"url":"https://git.kernel.org/stable/c/a30d421468300b1e7b2f233136aeb2db8013f555"},{"url":"https://git.kernel.org/stable/c/e5f1d301b4bdaa4206db251fdc691f623162b0a8"},{"url":"https://git.kernel.org/stable/c/fdeb190b0905a6aaed1e5d6adfb8613214748d7d"},{"url":"https://git.kernel.org/stable/c/ed49684e69f846bf50b5050651ccdb87cfd152c0"},{"url":"https://git.kernel.org/stable/c/f128740f39ab28d1f4ad5bdd10f3e117eec0c374"},{"url":"https://git.kernel.org/stable/c/c3730b8373bb5059d735509b9e6a00d7eb337d7c"}],"title":"tracing: Fix race between update_event_fields and, event_define_fields","x_generator":{"engine":"bippy-1.2.0"}}}}