CVE-2026-18747

The MCUmgr SMP-over-console transport in the Zephyr RTOS (specifically affecting CONFIG_MCUMGR_TRANSPORT_UART and CONFIG_MCUMGR_TRANSPORT_SHELL) is vulnerable to an integer underflow in mcumgr_serial_process_frag(). The system fails to properly validate declared packet lengths of 0 or 1; when the...

CVE-2026-10648

mcumgrserialprocessfrag in subsys/mgmt/mcumgr/transport/src/serialutil.c calls netbufreset on the result of smppacketalloc before checking it for NULL. smppacketalloc uses netbufallocKNOWAIT against the shared MCUmgr packet pool CONFIGMCUMGRTRANSPORTNETBUFCOUNT, default 4, which returns NULL when...

CVE-2026-10648 NULL-pointer dereference in MCUmgr serial/console SMP transport on buffer-pool exhaustion

mcumgrserialprocessfrag in subsys/mgmt/mcumgr/transport/src/serialutil.c calls netbufreset on the result of smppacketalloc before checking it for NULL. smppacketalloc uses netbufallocKNOWAIT against the shared MCUmgr packet pool CONFIGMCUMGRTRANSPORTNETBUFCOUNT, default 4, which returns NULL when...

CVE-2026-10648

CVE-2026-10648 affects Zephyr’s MCUmgr serial/console SMP transport paths. The bug occurs in mcumgr_serial_process_frag() where net_buf_reset() is invoked on the result of smp_packet_alloc() before checking NULL. smp_packet_alloc() draws from the shared MCUmgr packet pool (default 4 entries) via ...

CVE-2026-10648

mcumgrserialprocessfrag in subsys/mgmt/mcumgr/transport/src/serialutil.c calls netbufreset on the result of smppacketalloc before checking it for NULL. smppacketalloc uses netbufallocKNOWAIT against the shared MCUmgr packet pool CONFIGMCUMGRTRANSPORTNETBUFCOUNT, default 4, which returns NULL when...

CVE-2026-10648 NULL-pointer dereference in MCUmgr serial/console SMP transport on buffer-pool exhaustion

mcumgrserialprocessfrag in subsys/mgmt/mcumgr/transport/src/serialutil.c calls netbufreset on the result of smppacketalloc before checking it for NULL. smppacketalloc uses netbufallocKNOWAIT against the shared MCUmgr packet pool CONFIGMCUMGRTRANSPORTNETBUFCOUNT, default 4, which returns NULL when...

PT-2026-53755

Name of the Vulnerable Software and Affected Versions Zephyr version 4.4.0 Description An issue exists where the mcumgr serial process frag function in subsys/mgmt/mcumgr/transport/src/serial util.c calls net buf reset on the result of smp packet alloc without first verifying if the result is NUL...