Rapid7 Vulnerability & Exploit Database

CentOS Linux: CVE-2018-18281: Important: kernel-alt security and bug fix update (Multiple Advisories)

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CentOS Linux: CVE-2018-18281: Important: kernel-alt security and bug fix update (Multiple Advisories)

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:P/I:P/A:P)
Published
10/30/2018
Created
08/29/2019
Added
08/28/2019
Modified
05/25/2023

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.

Solution(s)

  • centos-upgrade-kernel
  • centos-upgrade-kernel-rt

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