FreeBSD: VID-8DB74C04-D794-11EA-88F8-901B0EF719AB (CVE-2020-7460): FreeBSD -- sendmsg(2) privilege escalation

Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.

From VID-8DB74C04-D794-11EA-88F8-901B0EF719AB:

Problem Description:

When handling a 32-bit sendmsg(2) call, the compat32 subsystem copies the

control message to be transmitted (if any) into kernel memory, and adjusts

alignment of control message headers. The code which performs this work

contained a time-of-check to time-of-use (TOCTOU) vulnerability which allows a

malicious userspace program to modify control message headers after they were

validated by the kernel.

Impact:

The TOCTOU bug can be exploited by an unprivileged malicious userspace program

to trigger privilege escalation.