CVE-2026-12364
Zephyr syscall verifier flaw allows unprivileged kernel memory reads and kernel crashes.
Is CVE-2026-12364 being exploited?
Not confirmed. CVE-2026-12364 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.12% probability of exploitation in the next 30 days.
How severe is CVE-2026-12364?
CVE-2026-12364 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-12364?
Yes. A fix has been recorded for CVE-2026-12364. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12364 affect?
CVE-2026-12364 affects Zephyr RTOS (z_log_msg_static_create syscall, subsys/logging/log_msg.c). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12364?
Apply Zephyr security update; restrict unprivileged user access and log backend exposure.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unprivileged user can cause kernel panic (DoS) and read arbitrary kernel memory into logs, exposing sensitive kernel data.
Immediate action required
- affected>= 2.6.0 and < 4.4.2
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.