Stack Buffer Overflow Vulnerability in FreeBSD Routing Components

CVE-2026-3038

What is CVE-2026-3038?

A vulnerability exists within the FreeBSD routing components caused by improper serialization of socket address structures. The rtsock_msg_buffer() function does not adequately validate the length of the source sockaddr, leading to a potential 127-byte stack buffer overflow. With a crafted request, an unprivileged user may trigger this overflow, which overwrites a critical stack canary value. This results in a kernel panic upon return from the affected function. Although the kernel attempts to mitigate risks associated with this vulnerability, potential exploits may arise if an attacker discovers the canary value through other kernel vulnerabilities, potentially allowing local privilege escalation.

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References