CVE-2018-18281

2018-10-30T18:29:00
ID CVE-2018-18281
Type cve
Reporter cve@mitre.org
Modified 2020-08-24T17:37:00

Description

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.