CVE-2026-77234
Privilege escalation in FreeRTOS-Kernel allowing unprivileged tasks to execute in kernel context.
Is CVE-2026-77234 being exploited?
Not confirmed. CVE-2026-77234 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-2026-77234?
CVE-2026-77234 is rated Critical with a CVSS score of 9.3. 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-2026-77234?
Yes. A fix has been recorded for CVE-2026-77234. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-77234 affect?
CVE-2026-77234 affects FreeRTOS-Kernel < 11.3.1, MPU-enabled ports, Embedded/IoT devices using FreeRTOS. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-77234?
Upgrade FreeRTOS-Kernel to 11.3.1 or later immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local privilege escalation: an unprivileged task on MPU-enabled ports can execute code in privileged kernel context, enabling device/firmware compromise.
Patch when possible
- affected>= 7.0.0 and <= 11.3.0
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.