Multiple race conditions in the ext4 filesystem implementation in the Linux kernel before 4.5 allow local users to cause a denial of service (disk corruption) by writing to a page that is associated with a different userβs file after unsynchronized hole punching and page-fault handling.
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ea3d7209ca01da209cda6f0dea8be9cc4b7a933b
www.openwall.com/lists/oss-security/2016/04/01/4
www.securityfocus.com/bid/85798
www.securitytracker.com/id/1035455
www.ubuntu.com/usn/USN-3005-1
www.ubuntu.com/usn/USN-3006-1
www.ubuntu.com/usn/USN-3007-1
access.redhat.com/errata/RHSA-2017:1842
access.redhat.com/errata/RHSA-2017:2077
access.redhat.com/errata/RHSA-2017:2669
bugzilla.redhat.com/show_bug.cgi?id=1323577
github.com/torvalds/linux/commit/ea3d7209ca01da209cda6f0dea8be9cc4b7a933b
lists.debian.org/debian-lts-announce/2020/06/msg00011.html
lists.debian.org/debian-lts-announce/2020/06/msg00013.html