CVE-2018-16884 Information

Description

A flaw was found in the Linux kernel’s NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw privilege escalation cannot be fully ruled out.

CVSS Vector

CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://www.securityfocus.com/bid/106253 https://access.redhat.com/errata/RHSA-2019:1873 https://access.redhat.com/errata/RHSA-2019:1891 https://access.redhat.com/errata/RHSA-2019:2696 https://access.redhat.com/errata/RHSA-2019:2730 https://access.redhat.com/errata/RHSA-2019:3309 https://access.redhat.com/errata/RHSA-2019:3517 https://access.redhat.com/errata/RHSA-2020:0204 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16884 https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html https://patchwork.kernel.org/cover/10733767/ https://patchwork.kernel.org/patch/10733769/ https://support.f5.com/csp/article/K21430012 https://usn.ubuntu.com/3932-1/ https://usn.ubuntu.com/3932-2/ https://usn.ubuntu.com/3980-1/ https://usn.ubuntu.com/3980-2/ https://usn.ubuntu.com/3981-1/ https://usn.ubuntu.com/3981-2/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.0