A use-after-free vulnerability can occur when refresh driver timers are refreshed in some circumstances during shutdown when the timer is deleted while still in use. This results in a potentially exploitable crash. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.
www.securityfocus.com/bid/105280
www.securitytracker.com/id/1041610
access.redhat.com/errata/RHSA-2018:2692
access.redhat.com/errata/RHSA-2018:2693
access.redhat.com/errata/RHSA-2018:3403
access.redhat.com/errata/RHSA-2018:3458
bugzilla.mozilla.org/show_bug.cgi?id=1470260
lists.debian.org/debian-lts-announce/2018/11/msg00011.html
security.gentoo.org/glsa/201810-01
security.gentoo.org/glsa/201811-13
usn.ubuntu.com/3761-1/
usn.ubuntu.com/3793-1/
www.debian.org/security/2018/dsa-4287
www.debian.org/security/2018/dsa-4327
www.mozilla.org/security/advisories/mfsa2018-20/
www.mozilla.org/security/advisories/mfsa2018-21/
www.mozilla.org/security/advisories/mfsa2018-25/