CVE-2026-12634 Out-of-bounds stack write in the settings NVS backend from over-reported nvs_read length

The NVS backend of the Zephyr settings subsystem subsys/settings/src/settingsnvs.c reads stored setting-name entries into fixed 74-byte stack buffers and NUL-terminates them with bufrc = '\0', where rc is the return value of nvsread. Per its contract, nvsread returns the full stored entry length...

CVE-2026-12634

In Zephyr's settings NVS backend (subsys/settings/src/settings_nvs.c), three functions (settings_nvs_cache_match, settings_nvs_load, settings_nvs_save) use the nvs_read() return value directly as a NUL-terminator index into 74-byte stack buffers without clamping, causing a single-byte out-of-boun...

CVE-2026-12634 Out-of-bounds stack write in the settings NVS backend from over-reported nvs_read length

The NVS backend of the Zephyr settings subsystem subsys/settings/src/settingsnvs.c reads stored setting-name entries into fixed 74-byte stack buffers and NUL-terminates them with bufrc = '\0', where rc is the return value of nvsread. Per its contract, nvsread returns the full stored entry length...

CVE-2026-12522 Stack buffer overflow in Zephyr hl7800 modem driver parsing network-supplied +CGCONTRDP address fields

The HL7800 cellular modem driver's +CGCONTRDP: response handler oncmdatcmdinfoipaddr in drivers/modem/vendorstandalone/hl7800.c parses the PDP-context dynamic parameters local address, subnet mask, gateway, and DNS servers that the cellular network assigns to the device. The response is linearize...

CVE-2026-12522 Stack buffer overflow in Zephyr hl7800 modem driver parsing network-supplied +CGCONTRDP address fields

The HL7800 cellular modem driver's +CGCONTRDP: response handler oncmdatcmdinfoipaddr in drivers/modem/vendorstandalone/hl7800.c parses the PDP-context dynamic parameters local address, subnet mask, gateway, and DNS servers that the cellular network assigns to the device. The response is linearize...

CVE-2026-12633 Out-of-bounds write in IPv6 6LoWPAN Context Option handling via unauthenticated Router Advertisement

The IPv6 neighbor-discovery code in subsys/net/ip/ipv6nbr.c processes the 6LoWPAN Context Option 6CO, RFC 6775 carried inside ICMPv6 Router Advertisements. In handlera6co the 8-bit contextlen field is taken directly from the packet and was never bounded to the RFC maximum of 128. The function...

CVE-2026-12631

The Zephyr kernel validates the kthreadjoin and kthreadabort system calls declared syscall in include/zephyr/kernel.h through threadobjvalidate in kernel/thread.c. Its default switch branch is the access-denied path, taken when kobjectvalidate returns -EPERM the calling user thread was never...

CVE-2026-12632

Zephyr's Precision Time Protocol receive handler ptpmsgpostrecv in subsys/net/lib/ptp/msg.c takes the 4-bit message type straight off the wire via ptpmsgtype msg-header.typemajorsdoid & 0xF, range 0-15 and uses it to index the msgsize table. That table only defines entries up to PTPMSGMANAGEMENT...

CVE-2026-12632 Out-of-bounds read in Zephyr PTP message parsing from unvalidated message type

Zephyr's Precision Time Protocol receive handler ptpmsgpostrecv in subsys/net/lib/ptp/msg.c takes the 4-bit message type straight off the wire via ptpmsgtype msg-header.typemajorsdoid & 0xF, range 0-15 and uses it to index the msgsize table. That table only defines entries up to PTPMSGMANAGEMENT...

CVE-2026-12632 Out-of-bounds read in Zephyr PTP message parsing from unvalidated message type

Zephyr's Precision Time Protocol receive handler ptpmsgpostrecv in subsys/net/lib/ptp/msg.c takes the 4-bit message type straight off the wire via ptpmsgtype msg-header.typemajorsdoid & 0xF, range 0-15 and uses it to index the msgsize table. That table only defines entries up to PTPMSGMANAGEMENT...

CVE-2026-12632

In Zephyr RTOS, ptp_msg_post_recv() in subsys/net/lib/ptp/msg.c indexes the 14-entry msg_size[] table using an attacker-controlled 4-bit message type (0xE/0xF) with no bounds check, causing out-of-bounds reads and writes via msg_tlv_post_recv(). Any host on the same link can trigger a crash (CVSS...

CVE-2026-12631

CVE-2026-12631 is a broken access-control flaw in the Zephyr RTOS kernel affecting the k_thread_join() and k_thread_abort() syscall validation path in kernel/thread.c. The root cause is a logic inversion: K_SYSCALL_VERIFY_MSG treats a non-zero (error) return as success, so the access-denied branc...

CVE-2026-12631 Broken access-control denial in k_thread_join/k_thread_abort syscall validation in Zephyr kernel

The Zephyr kernel validates the kthreadjoin and kthreadabort system calls declared syscall in include/zephyr/kernel.h through threadobjvalidate in kernel/thread.c. Its default switch branch is the access-denied path, taken when kobjectvalidate returns -EPERM the calling user thread was never...

EUVD-2026-61491

The Zephyr kernel validates the kthreadjoin and kthreadabort system calls declared syscall in include/zephyr/kernel.h through threadobjvalidate in kernel/thread.c. Its default switch branch is the access-denied path, taken when kobjectvalidate returns -EPERM the calling user thread was never...

CVE-2026-12631 Broken access-control denial in k_thread_join/k_thread_abort syscall validation in Zephyr kernel

The Zephyr kernel validates the kthreadjoin and kthreadabort system calls declared syscall in include/zephyr/kernel.h through threadobjvalidate in kernel/thread.c. Its default switch branch is the access-denied path, taken when kobjectvalidate returns -EPERM the calling user thread was never...

PT-2026-77336

Zephyr's Precision Time Protocol receive handler ptp msg post recv in subsys/net/lib/ptp/msg.c takes the 4-bit message type straight off the wire via ptp msg type msg-header.type major sdo id & 0xF, range 0-15 and uses it to index the msg size table. That table only defines entries up to PTP MSG...

PT-2026-77335

The Zephyr kernel validates the k thread join and k thread abort system calls declared syscall in include/zephyr/kernel.h through thread obj validate in kernel/thread.c. Its default switch branch is the access-denied path, taken when k object validate returns -EPERM the calling user thread was...

CVE-2026-9771

The flashcopy system call is verified by zvrfyflashcopy in drivers/flash/flashutil.c. On builds with CONFIGUSERSPACE enabled, this handler is the kernel-side trust boundary for a user-mode caller. Prior to the fix it validated only the output buffer KSYSCALLMEMORYWRITE and passed the two struct...

CVE-2026-12630

Zephyr's 6LoWPAN IP Header Compression IPHC uncompression code contains an out-of-bounds read in getihpcinlinedsize subsys/net/ip/6lo.c. The destination inline size is looked up in dainlinesizetable, which has 13 entries, using an index built from the M, DAC and DAM bits of the received IPHC...

CVE-2026-12519 Out-of-bounds stack read and write in Zephyr WNC-M14A2A modem socket-notify parsing

The WNC-M14A2A LTE-M modem driver mishandles unsolicited %NOTIFYEV: events in oncmdsocknotifyev drivers/modem/vendorstandalone/wncm14a2a.c. The response line is linearized into a fixed 40-byte stack buffer via netbuflinearize, which caps the copy at 39 bytes and returns outlen = 39. The two...