CVE-2018-16884

MEDIUM

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.

References

http://www.securityfocus.com/bid/106253

https://access.redhat.com/errata/RHSA-2019:1873

https://access.redhat.com/errata/RHSA-2019:1891

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/

Details

Source: MITRE

Published: 2018-12-18

Updated: 2019-05-29

Type: CWE-416

Risk Information

CVSS v2.0

Base Score: 6.7

Vector: AV:A/AC:L/Au:S/C:P/I:P/A:C

Impact Score: 8.5

Exploitability Score: 5.1

Severity: MEDIUM

CVSS v3.0

Base Score: 8

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

Impact Score: 5.9

Exploitability Score: 2.1

Severity: HIGH