PRIOn knowledge basePRION:CVE-2018-18281Design/Logic Flaw
Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. This is fixed in the following kernel versions: 4.9.135, 4.14.78, 4.18.16, 4.19.
References
packetstormsecurity.com/files/150001/Linux-mremap-TLB-Flush-Too-Late.html
www.openwall.com/lists/oss-security/2018/10/29/5
www.securityfocus.com/bid/105761
www.securityfocus.com/bid/106503
access.redhat.com/errata/RHSA-2019:0831
access.redhat.com/errata/RHSA-2019:2029
access.redhat.com/errata/RHSA-2019:2043
access.redhat.com/errata/RHSA-2020:0036
access.redhat.com/errata/RHSA-2020:0100
access.redhat.com/errata/RHSA-2020:0103
access.redhat.com/errata/RHSA-2020:0179
bugs.chromium.org/p/project-zero/issues/detail?id=1695
cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.78
cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.16
cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.135
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eb66ae030829605d61fbef1909ce310e29f78821
lists.debian.org/debian-lts-announce/2019/03/msg00017.html
lists.debian.org/debian-lts-announce/2019/03/msg00034.html
lists.debian.org/debian-lts-announce/2019/04/msg00004.html
usn.ubuntu.com/3832-1/
usn.ubuntu.com/3835-1/
usn.ubuntu.com/3871-1/
usn.ubuntu.com/3871-3/
usn.ubuntu.com/3871-4/
usn.ubuntu.com/3871-5/
usn.ubuntu.com/3880-1/
usn.ubuntu.com/3880-2/
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