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-2026-18746

parsewriteop in subsys/net/lib/lwm2m/lwm2mmessagehandling.c handles inbound CoAP WRITE/CREATE requests that carry a Block1 option. For the first block of a transfer it called initblockctx and then immediately stored the peer-selected block size with blockctx-ctx.blocksize = blocksize before...

CVE-2026-18746: NULL Pointer Dereference

parsewriteop in subsys/net/lib/lwm2m/lwm2mmessagehandling.c handles inbound CoAP WRITE/CREATE requests that carry a Block1 option. For the first block of a transfer it called initblockctx and then immediately stored the peer-selected block size with blockctx-ctx.blocksize = blocksize before...

CVE-2026-18417: Access of Resource Using Incompatible Type

The native BSD-socket layer recorded a pending asynchronous socket error by type-punning it into struct netcontext's void userdata field ctx-userdata = INTTOPOINTER-status in zsockacceptedcb, zsockreceivedcb, zsockconnectedcb and zsockclosectx in subsys/net/lib/sockets/socketsinet.c, reading it...

CVE-2026-18746 NULL pointer dereference in Zephyr LwM2M client when the CoAP Block1 context pool is exhausted

parsewriteop in subsys/net/lib/lwm2m/lwm2mmessagehandling.c handles inbound CoAP WRITE/CREATE requests that carry a Block1 option. For the first block of a transfer it called initblockctx and then immediately stored the peer-selected block size with blockctx-ctx.blocksize = blocksize before...

CVE-2026-18417 Wild pointer dereference in Zephyr BSD sockets when a TCP listening socket reports an asynchronous error

The native BSD-socket layer recorded a pending asynchronous socket error by type-punning it into struct netcontext's void userdata field ctx-userdata = INTTOPOINTER-status in zsockacceptedcb, zsockreceivedcb, zsockconnectedcb and zsockclosectx in subsys/net/lib/sockets/socketsinet.c, reading it...

CVE-2026-18416

The CoAP link-format helper matchpathuri in subsys/net/lib/coap/coaplinkformat.c compares a registered resource path against the URI carried in a Uri-Query href= option. That URI is not NUL terminated, but the inner character loop advanced its index k once per path character without ever testing ...

CVE-2026-16513

The userspace verifier zvrfyrtiosqecopyingethandles in subsys/rtio/rtiosyscalls.c subsys/rtio/rtiohandlers.c before v4.3.0 validated the RTIO object handle and the sqes input array, but not the handle out-parameter. On the first loop iteration it executed handle = sqe, storing the kernel address ...

CVE-2026-18416 Out-of-bounds read in CoAP well-known-core Uri-Query href matching (match_path_uri)

The CoAP link-format helper matchpathuri in subsys/net/lib/coap/coaplinkformat.c compares a registered resource path against the URI carried in a Uri-Query href= option. That URI is not NUL terminated, but the inner character loop advanced its index k once per path character without ever testing ...

EUVD-2026-88473

ieee802154send in subsys/net/l2/ieee802154/ieee802154.c copies the outgoing packet into a single fixed 125-byte transmit buffer txframebufpool, sized IEEE802154MTU. In builds with CONFIGNETL2IEEE802154FRAGMENT enabled the default whenever CONFIGNET6LO is set, the branch taken when 6LoWPAN...

EUVD-2026-88470

The userspace verifier zvrfyrtiosqecopyingethandles in subsys/rtio/rtiosyscalls.c subsys/rtio/rtiohandlers.c before v4.3.0 validated the RTIO object handle and the sqes input array, but not the handle out-parameter. On the first loop iteration it executed handle = sqe, storing the kernel address ...

CVE-2026-16513 Missing write validation of user-supplied handle pointer in the RTIO syscall verifier allows arbitrary kernel write

The userspace verifier zvrfyrtiosqecopyingethandles in subsys/rtio/rtiosyscalls.c subsys/rtio/rtiohandlers.c before v4.3.0 validated the RTIO object handle and the sqes input array, but not the handle out-parameter. On the first loop iteration it executed handle = sqe, storing the kernel address ...

CVE-2026-16513

The Zephyr RTOS (with CONFIG_USERSPACE and CONFIG_RTIO enabled) is vulnerable to an arbitrary kernel write due to missing write validation in the z_vrfy_rtio_sqe_copy_in_get_handles() verifier within subsys/rtio/rtio_syscalls.c. The system fails to check the handle out-parameter, allowing a user-...

PT-2026-102355

Name of the Vulnerable Software and Affected Versions ZoAP versions 1.8.0 through 1.9.x Description The CoAP link-format helper match path uri in subsys/net/lib/coap/coap link format.c contains an out-of-bounds read. The issue occurs when comparing a registered resource path against a URI in a...

PT-2026-102412

Name of the Vulnerable Software and Affected Versions Zephyr LwM2M client affected versions not specified Description The parse write op function in subsys/net/lib/lwm2m/lwm2m message handling.c contains a NULL pointer dereference when handling inbound CoAP WRITE/CREATE requests with a Block1...

CVE-2026-18416: Out-of-bounds Read

The CoAP link-format helper matchpathuri in subsys/net/lib/coap/coaplinkformat.c compares a registered resource path against the URI carried in a Uri-Query href= option. That URI is not NUL terminated, but the inner character loop advanced its index k once per path character without ever testing ...

CVE-2026-16513: Out-of-bounds Write

The userspace verifier zvrfyrtiosqecopyingethandles in subsys/rtio/rtiosyscalls.c subsys/rtio/rtiohandlers.c before v4.3.0 validated the RTIO object handle and the sqes input array, but not the handle out-parameter. On the first loop iteration it executed handle = sqe, storing the kernel address ...

PT-2026-102351

Name of the Vulnerable Software and Affected Versions RTIO versions prior to 4.3.0 Description The userspace verifier function z vrfy rtio sqe copy in get handles in subsys/rtio/rtio syscalls.c and subsys/rtio/rtio handlers.c in earlier versions fails to validate the handle out-parameter. This...

CVE-2026-16515 ICMPv6 error messages sent for multicast-destined packets and non-unique source addresses enable network amplification in Zephyr's IPv6 stack

neticmpv6senderror in subsys/net/ip/icmpv6.c implemented only one of the three RFC 4443 section 2.4 suppression rules do not answer an ICMPv6 error with an ICMPv6 error. It did not check whether the triggering packet's source address identifies a single node rule e.6 or whether the packet was sen...

CVE-2026-16515: Insufficient Control of Network Message Volume (Network Amplification)

neticmpv6senderror in subsys/net/ip/icmpv6.c implemented only one of the three RFC 4443 section 2.4 suppression rules do not answer an ICMPv6 error with an ICMPv6 error. It did not check whether the triggering packet's source address identifies a single node rule e.6 or whether the packet was sen...