{"apiVersion":"1.0","identifier":"CVE-2026-74636","description":"In the Linux kernel, the following vulnerability has been resolved: tracing: Fix race between update_event_fields and, event_define_fields The following sequence may leads race between event_define_fields() and update_event_fields(): CPU0 (loads module A) CPU1 (loads module B) =============================== =============================== load_module(A) load_module(B) notifier_call_chain notifier_call_chain trace_module_notify trace_module_notify mutex_lock(&event_mutex) trace_event_update_all() trace_module_add_events(A) down_write(&trace_event_sem) __register_event(call_A) __add_event_to_tracers(call_A) event_define_fields(call_A) for each f: list_for_each_entry(field, list_add(&f->link, &class->fields, link) &class->fields) field = class->fields->next; Where access to the class->fields is not protected by the event_mutex in trace_event_update_all(). This produces the following panic: Unable to handle kernel access ... at virtual address 0000000000000018 pc : update_event_fields+0xf8/0x368 Call trace: update_event_fields+0xf8/0x368 trace_event_update_all+0x7c/0x2b4 trace_module_notify+0x4c/0x1dc notifier_call_chain+0x84/0x168 blocking_notifier_call_chain_robust+0x64/0xd4 load_module+0x10c8/0x123c __arm64_sys_finit_module+0x230/0x31c Fix by taking event_mutex in trace_event_update_all() before trace_event_sem.","publishedAt":"2026-08-22T16:16:36","lastModifiedAt":"2026-08-22T16:16:36","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74636","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00173,"riskScore":0,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74636","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74636","en":"https://www.redsauce.net/en/cves/CVE-2026-74636","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74636","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74636","de":"https://www.redsauce.net/de/cves/CVE-2026-74636","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74636","el":"https://www.redsauce.net/el/cves/CVE-2026-74636"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74636"}}