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CVE-2019-5595

Status Candidate

Overview

In FreeBSD before 11.2-STABLE(r343782), 11.2-RELEASE-p9, 12.0-STABLE(r343781), and 12.0-RELEASE-p3, kernel callee-save registers are not properly sanitized before return from system calls, potentially allowing some kernel data used in the system call to be exposed.

Related Files

FreeBSD Security Advisory - FreeBSD-SA-19:01.syscall
Posted Feb 6, 2019
Authored by Konstantin Belousov | Site security.freebsd.org

FreeBSD Security Advisory - The callee-save registers are used by kernel and for some of them (%r8, %r10, and for non-PTI configurations, %r9) the content is not sanitized before return from syscalls, potentially leaking sensitive information. Typically an address of some kernel data structure used in the syscall implementation, is exposed.

tags | advisory, kernel
systems | freebsd
advisories | CVE-2019-5595
SHA-256 | 236a816eea4311588ca36396d798417774e37912f40da745164d7609d6d42425
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