CVE-2026-18747

The MCUmgr SMP-over-console transport decodes a base64 frame, reads a 16-bit packet length from it, verifies a CRC and then unconditionally strips the trailing CRC with rxctxt-nb-len -= 2U; in mcumgrserialprocessfrag subsys/mgmt/mcumgr/transport/src/serialutil.c. mcumgrserialextractlen accepted a...

CVE-2026-18747: Out-of-bounds Read

The MCUmgr SMP-over-console transport decodes a base64 frame, reads a 16-bit packet length from it, verifies a CRC and then unconditionally strips the trailing CRC with rxctxt-nb-len -= 2U; in mcumgrserialprocessfrag subsys/mgmt/mcumgr/transport/src/serialutil.c. mcumgrserialextractlen accepted a...

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-2026-18747 Integer underflow of net_buf length in the MCUmgr serial (SMP over console) transport leads to out-of-bounds read

The MCUmgr SMP-over-console transport decodes a base64 frame, reads a 16-bit packet length from it, verifies a CRC and then unconditionally strips the trailing CRC with rxctxt-nb-len -= 2U; in mcumgrserialprocessfrag subsys/mgmt/mcumgr/transport/src/serialutil.c. mcumgrserialextractlen accepted a...

CVE-2026-18747 Integer underflow of net_buf length in the MCUmgr serial (SMP over console) transport leads to out-of-bounds read

The MCUmgr SMP-over-console transport decodes a base64 frame, reads a 16-bit packet length from it, verifies a CRC and then unconditionally strips the trailing CRC with rxctxt-nb-len -= 2U; in mcumgrserialprocessfrag subsys/mgmt/mcumgr/transport/src/serialutil.c. mcumgrserialextractlen accepted a...

CVE-2026-18747

The MCUmgr SMP-over-console transport decodes a base64 frame, reads a 16-bit packet length from it, verifies a CRC and then unconditionally strips the trailing CRC with rxctxt-nb-len -= 2U; in mcumgrserialprocessfrag subsys/mgmt/mcumgr/transport/src/serialutil.c. mcumgrserialextractlen accepted a...

CVE-2026-18747 Integer underflow of net_buf length in the MCUmgr serial (SMP over console) transport leads to out-of-bounds read

The MCUmgr SMP-over-console transport decodes a base64 frame, reads a 16-bit packet length from it, verifies a CRC and then unconditionally strips the trailing CRC with rxctxt-nb-len -= 2U; in mcumgrserialprocessfrag subsys/mgmt/mcumgr/transport/src/serialutil.c. mcumgrserialextractlen accepted a...

EUVD-2026-88575

The MCUmgr SMP-over-console transport decodes a base64 frame, reads a 16-bit packet length from it, verifies a CRC and then unconditionally strips the trailing CRC with rxctxt-nb-len -= 2U; in mcumgrserialprocessfrag subsys/mgmt/mcumgr/transport/src/serialutil.c. mcumgrserialextractlen accepted a...

PT-2026-102413

Name of the Vulnerable Software and Affected Versions MCUmgr affected versions not specified Description An integer underflow exists in the SMP-over-console transport when processing base64 frames. The function mcumgr serial process frag in subsys/mgmt/mcumgr/transport/src/serial util.c...

CVE-2026-15892

The mcumgr SMP settings-management group handlers settingsmgmtread, settingsmgmtwrite, and settingsmgmtdelete in subsys/mgmt/mcumgr/grp/settingsmgmt/src/settingsmgmt.c allocate a keyname buffer and, for read, a data buffer via kmalloc when CONFIGMCUMGRGRPSETTINGSBUFFERTYPEHEAP is enabled, relying...

CVE-2026-15892 Heap memory leak in mcumgr settings-management handlers on access-hook rejection leads to denial of service

The mcumgr SMP settings-management group handlers settingsmgmtread, settingsmgmtwrite, and settingsmgmtdelete in subsys/mgmt/mcumgr/grp/settingsmgmt/src/settingsmgmt.c allocate a keyname buffer and, for read, a data buffer via kmalloc when CONFIGMCUMGRGRPSETTINGSBUFFERTYPEHEAP is enabled, relying...

CVE-2026-15892

CVE-2026-15892 is a heap memory leak in Zephyr Project RTOS 's mcumgr settings-management handlers (settings_mgmt_read(), settings_mgmt_write(), settings_mgmt_delete()). When CONFIG_MCUMGR_GRP_SETTINGS_BUFFER_TYPE_HEAP and CONFIG_MCUMGR_GRP_SETTINGS_ACCESS_HOOK are both enabled, an early return o...

EUVD-2026-77133

The mcumgr SMP settings-management group handlers settingsmgmtread, settingsmgmtwrite, and settingsmgmtdelete in subsys/mgmt/mcumgr/grp/settingsmgmt/src/settingsmgmt.c allocate a keyname buffer and, for read, a data buffer via kmalloc when CONFIGMCUMGRGRPSETTINGSBUFFERTYPEHEAP is enabled, relying...

CVE-2026-15892 Heap memory leak in mcumgr settings-management handlers on access-hook rejection leads to denial of service

The mcumgr SMP settings-management group handlers settingsmgmtread, settingsmgmtwrite, and settingsmgmtdelete in subsys/mgmt/mcumgr/grp/settingsmgmt/src/settingsmgmt.c allocate a keyname buffer and, for read, a data buffer via kmalloc when CONFIGMCUMGRGRPSETTINGSBUFFERTYPEHEAP is enabled, relying...

CVE-2026-15892 Heap memory leak in mcumgr settings-management handlers on access-hook rejection leads to denial of service

The mcumgr SMP settings-management group handlers settingsmgmtread, settingsmgmtwrite, and settingsmgmtdelete in subsys/mgmt/mcumgr/grp/settingsmgmt/src/settingsmgmt.c allocate a keyname buffer and, for read, a data buffer via kmalloc when CONFIGMCUMGRGRPSETTINGSBUFFERTYPEHEAP is enabled, relying...

CVE-2026-15892: Missing Release of Memory after Effective Lifetime

The mcumgr SMP settings-management group handlers settingsmgmtread, settingsmgmtwrite, and settingsmgmtdelete in subsys/mgmt/mcumgr/grp/settingsmgmt/src/settingsmgmt.c allocate a keyname buffer and, for read, a data buffer via kmalloc when CONFIGMCUMGRGRPSETTINGSBUFFERTYPEHEAP is enabled, relying...

PT-2026-90984

Name of the Vulnerable Software and Affected Versions mcumgr affected versions not specified Description A memory leak occurs in the SMP settings-management group handlers settings mgmt read, settings mgmt write, and settings mgmt delete within subsys/mgmt/mcumgr/grp/settings mgmt/src/settings...

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

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...

EUVD-2026-40239

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...