Due to the interaction between devfs and VFS, a race condition exists where the kernel might dereference a NULL pointer.
Successful exploitation of the race condition can lead to local kernel privilege escalation, kernel data corruption and/or crash.
To exploit this vulnerability, an attacker must be able to run code with user privileges on the target system.
An errata note, FreeBSD-EN-09:05.null has been released simultaneously to this advisory, and contains a kernel patch implementing a workaround for a more broad class of vulnerabilities. However, prior to those changes, no workaround is available.
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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Team. Refer to "FreeBSD Security Information" for more information.