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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-74636

tracing: Fix race between update_event_fields and, event_define_fields

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 7c6bd60999f32138e3b73fd97ea11ef47a94de25 to < 4e39f7b4d9d36508c53e89e6cbc640728df870b5affected
  • b3bc8547d3be60898818885f5bf22d0a62e2eb48 to < a30d421468300b1e7b2f233136aeb2db8013f555affected
  • b3bc8547d3be60898818885f5bf22d0a62e2eb48 to < e5f1d301b4bdaa4206db251fdc691f623162b0a8affected
  • b3bc8547d3be60898818885f5bf22d0a62e2eb48 to < fdeb190b0905a6aaed1e5d6adfb8613214748d7daffected
  • b3bc8547d3be60898818885f5bf22d0a62e2eb48 to < ed49684e69f846bf50b5050651ccdb87cfd152c0affected
  • b3bc8547d3be60898818885f5bf22d0a62e2eb48 to < f128740f39ab28d1f4ad5bdd10f3e117eec0c374affected
  • b3bc8547d3be60898818885f5bf22d0a62e2eb48 to < c3730b8373bb5059d735509b9e6a00d7eb337d7caffected
  • 55defdf935fab9f2989a197aae1042c082d9a343affected
  • 0c53a5c80e6e286733381a1d9f255ba4039e2e45affected
  • 5.15.33 to < 5.15.216affected
  • 5.16.19 to < 5.17affected
  • 5.17.2 to < 5.18affected

Linux Linux

Default version status: affected

  • 5.18affected
  • 0 to < 5.18unaffected
  • 5.15.216 to ≤ 5.15.*unaffected
  • 6.1.183 to ≤ 6.1.*unaffected
  • 6.6.152 to ≤ 6.6.*unaffected
  • 6.12.104 to ≤ 6.12.*unaffected
  • 6.18.45 to ≤ 6.18.*unaffected
  • 7.1.9 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References