ZephyrProject Zephyr up to 4.4.0 Coredump Shell coredump_shell.c print_coredump_hdr tgt_code out-of-bounds

Summaryinfo

A vulnerability described as critical has been identified in ZephyrProject Zephyr up to 4.4.0. Affected by this issue is the function print_coredump_hdr of the file subsys/debug/coredump/coredump_shell.c of the component Coredump Shell. Such manipulation of the argument tgt_code leads to out-of-bounds. This vulnerability is uniquely identified as CVE-2026-10684. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in ZephyrProject Zephyr up to 4.4.0 and classified as critical. Affected by this issue is the function print_coredump_hdr of the file subsys/debug/coredump/coredump_shell.c of the component Coredump Shell. The manipulation of the argument tgt_code with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In subsys/debug/coredump/coredump_shell.c, print_coredump_hdr() used the 16-bit tgt_code field of a stored Zephyr coredump header directly as an index into coredump_target_code2str[], a fixed 7-element array of string pointers, with no bounds check. A stored coredump whose tgt_code is >= 7 causes an out-of-bounds read of a char* up to ~64K entries past the array; that value is passed as the %s argument to shell_print, which dereferences and walks it as a string. The result is either disclosure of device memory contents to the shell user or a crash when the out-of-bounds pointer is unmapped. The defect is reached via the coredump print shell command (cmd_coredump_print_stored_dump -> pretty_print_coredump -> parse_and_print_coredump -> print_coredump_hdr). The tgt_code field is device-generated and in-range during normal crash handling, so triggering requires local shell access plus the ability to stage or corrupt the stored coredump in the flash/in-memory backend. Introduced in v4.2.0 (commit 13abd7fe730) and present through v4.4.0; fixed by clamping out-of-range codes to the 'unknown' (index 0) entry.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-10684 since 06/02/2026. The exploitation is known to be easy. Local access is required to approach this attack. Additional levels of successful authentication are required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 4.3.1 eliminates this vulnerability.

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Productinfo

Type

• Project Management Software

Vendor

• ZephyrProject

Name

• Zephyr

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4.0

CPE 2.3info

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CPE 2.2info

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