FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

FreeBSD -- Kernel memory disclosure in freebsd32_ioctl

Affected packages
11.2 <= FreeBSD-kernel < 11.2_12
11.3 <= FreeBSD-kernel < 11.3_1


VuXML ID 6b856e00-b30a-11e9-a87f-a4badb2f4699
Discovery 2019-07-24
Entry 2019-07-30

Problem Description:

Due to insufficient initialization of memory copied to userland in the components listed above small amounts of kernel memory may be disclosed to userland processes.


A user who can invoke 32-bit FreeBSD ioctls may be able to read the contents of small portions of kernel memory.

Such memory might contain sensitive information, such as portions of the file cache or terminal buffers. This information might be directly useful, or it might be leveraged to obtain elevated privileges in some way; for example, a terminal buffer might include a user-entered password.


CVE Name CVE-2019-5605
FreeBSD Advisory SA-19:14.freebsd32