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

https://patchwork.kernel.org/patch/10733769/

https://patchwork.kernel.org/cover/10733767/

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16884

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

https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html

https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html

https://usn.ubuntu.com/3932-2/

https://usn.ubuntu.com/3932-1/

https://support.f5.com/csp/article/K21430012

https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html

https://usn.ubuntu.com/3981-1/

https://usn.ubuntu.com/3980-1/

https://usn.ubuntu.com/3980-2/

https://usn.ubuntu.com/3981-2/

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

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

https://access.redhat.com/errata/RHSA-2019:2696

https://access.redhat.com/errata/RHSA-2019:2730

https://access.redhat.com/errata/RHSA-2019:3517

https://access.redhat.com/errata/RHSA-2019:3309

https://access.redhat.com/errata/RHSA-2020:0204

https://www.oracle.com/security-alerts/cpuApr2021.html

Details

Risk Information

CVSS v2

CVSS v3