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Stack Buffer Overflow in socketcand 0.4.2 main()
CVE-2026-37538 is a stack-based buffer overflow in socketcand version 0.4.2. According to the provided content, the flaw is in socketcand.c within the main() function, where a CAN frame identifier string / bus_name is copied into a fixed-size stack buffer without validating its length first. An attacker able to supply an overly long crafted bus_name or CAN identifier string can cause the copy operation to write past the end of the stack buffer, corrupting adjacent stack memory. The disclosed impact explicitly includes denial of service, with the possibility of other unspecified impacts depending on runtime conditions and exploitability.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation can crash the socketcand process, resulting in denial of service. Because the vulnerability is a stack buffer overflow caused by attacker-controlled input being copied past a fixed-size stack buffer, memory corruption beyond a simple crash is also possible. The provided content does not confirm code execution, so the verified impact is denial of service with other unspecified memory-corruption impacts possible.
If you can’t patch tonight, do this now.
Until a patched release is deployed, restrict exposure of socketcand to trusted networks and trusted input sources only. Prevent untrusted clients from supplying CAN frame identifier strings or bus_name values to the service. Where possible, place socketcand behind network access controls, disable unnecessary remote access, and add input filtering or wrapper validation to reject overlong identifiers before they reach the vulnerable parsing path. Runtime hardening such as stack canaries, ASLR, and compiler hardening flags may reduce exploit reliability but do not eliminate the underlying flaw.
Patch, then assume compromise.
Upgrade from socketcand 0.4.2 to a fixed version if one is available from the vendor or project maintainer. The vulnerable code in socketcand.c main() should be corrected by enforcing strict length validation on the CAN frame identifier string / bus_name before copying it into a stack buffer, and by replacing unsafe copy logic with bounded operations that respect the destination buffer size. If source-level remediation is required, ensure all identifier parsing paths reject oversized input before any stack copy occurs.
No public exploits tracked yet. Mallory keeps watching.
5 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.