CVE-2026-12629 PL011 UART error interrupts never cleared, enabling an external-peer interrupt-storm denial of service

The ARM PL011 UART driver in drivers/serial/uartpl011.c fails to acknowledge receive error interrupts. On the PL011, the framing, parity, break, and overrun error interrupts PL011IMSCERRORMASK are cleared only by writing the interrupt-clear register UARTICR; reading the data register clears the R...

CVE-2026-12629

The Zephyr RTOS ARM PL011 UART driver's pl011_isr() only cleared CTS interrupts, never writing UARTICR for error bits. An attacker controlling a serial peer can inject line errors to trigger a permanent interrupt-storm livelock (availability DoS), CVSS 4.6 (MEDIUM). Fix commit: https://github.com...