CVE-2026-10684 Out-of-bounds read in coredump shell when printing stored-dump target code
An out-of-bounds read in Zephyr's coredump shell allows local attackers to disclose memory or crash the system by corrupting stored dump headers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-10684?
CVE-2026-10684 is a low-severity vulnerability in zephyrproject zephyr, published on 29 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-10684?
How do I fix CVE-2026-10684?
No fix has been published for CVE-2026-10684 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-10684 being exploited?
There is no known exploitation of CVE-2026-10684 in the wild and no public exploit code.
Sources
Also known as GHSA-9fw2-4429-49q8.