CVE-2018-18281

CVE Details

Release Date:	2018-10-30
Impact:	None	What is this?

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.

See more information about CVE-2018-18281 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.8
Vector String:	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Version:	3.0
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 6 (dtrace-modules-3.8.13-118.46.1.el6uek)	ELSA-2020-5706	2020-06-04
Oracle Linux version 6 (kernel-uek)	ELSA-2020-5706	2020-06-04
Oracle Linux version 6 (kernel-uek)	ELSA-2020-5708	2020-06-03
Oracle Linux version 7 (dtrace-modules-3.8.13-118.46.1.el7uek)	ELSA-2020-5706	2020-06-04
Oracle Linux version 7 (kernel)	ELSA-2019-2029	2019-08-13
Oracle Linux version 7 (kernel-uek)	ELSA-2020-5706	2020-06-04
Oracle Linux version 7 (kernel-uek)	ELSA-2020-5708	2020-06-03
Oracle VM version 3.4 (kernel-uek)	OVMSA-2020-0020	2020-06-05