CVE-2018-18281

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.

Affected products

Alt Linux, Centos, Linux Kernel, Red Hat, Suse, Ubuntu

Linux Linux Kernel

< 4.9.135, 4.14.78, 4.18.16, 4.19

Fix

Available

CVSS 3.0

7.8 HIGH

EPSS

1.1% (62th percentile)

Weakness

CWE-459

NVD status

Modified

Published

2018-10-30