CVE-2026-74636: linux

CVSS: UnknownReceived
AliasesUBUNTU-CVE-2026-74636DEBIAN-CVE-2026-74636
Published 22-08-2026Last modified 22-08-2026
Open JSON

Vulnerability summary

CVE-2026-74636 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.2% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 8
MGASA-2026-0506OPENSUSE-SU-2026:22091-1SUSE-SU-2026:4640-1SUSE-SU-2026:4706-1USN-8875-1USN-8875-2

Timeline

  1. 22-08-2026
    PublishedVulnerability first disclosed.

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linux< 5.15.0-198.208 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1117.124 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.9-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 7c6bd60999f32138e3b73fd97ea11ef47a94de25, < 4e39f7b4d9d36508c53e89e6cbc640728df870b5 | ≥ b3bc8547d3be60898818885f5bf22d0a62e2eb48, < a30d421468300b1e7b2f233136aeb2db8013f555 | ≥ b3bc8547d3be60898818885f5bf22d0a62e2eb48, < e5f1d301b4bdaa4206db251fdc691f623162b0a8 | ≥ b3bc8547d3be60898818885f5bf22d0a62e2eb48, < fdeb190b0905a6aaed1e5d6adfb8613214748d7d | ≥ b3bc8547d3be60898818885f5bf22d0a62e2eb48, < ed49684e69f846bf50b5050651ccdb87cfd152c0 | ≥ b3bc8547d3be60898818885f5bf22d0a62e2eb48, < f128740f39ab28d1f4ad5bdd10f3e117eec0c374 | ≥ b3bc8547d3be60898818885f5bf22d0a62e2eb48, < c3730b8373bb5059d735509b9e6a00d7eb337d7c | 55defdf935fab9f2989a197aae1042c082d9a343 | 0c53a5c80e6e286733381a1d9f255ba4039e2e45 | ≥ 5.15.33, < 5.15.216 | ≥ 5.16.19, < 5.17 | ≥ 5.17.2, < 5.18 | 5.18

3 vendors · 160 products

References

17 links
Show all 17 references