Fixed
Created: Oct 31, 2018
Updated: Aug 14, 2019
Resolved Date: Aug 14, 2019
Found In Version: 6.0.0.38
Fix Version: 6.0.0.38
Severity: Standard
Applicable for: Wind River Linux 6
Component/s: Kernel
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.
https://nvd.nist.gov/vuln/detail/CVE-2018-18281
