CVE-2018-16884

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CVE-2018-16884

Summary:

Details: 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://access.redhat.com/errata/RHSA-2019:2730, https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html, https://usn.ubuntu.com/3981-2/, https://www.oracle.com/security-alerts/cpuApr2021.html, https://access.redhat.com/errata/RHSA-2019:1891, https://access.redhat.com/errata/RHSA-2019:3309, https://usn.ubuntu.com/3981-1/, https://access.redhat.com/errata/RHSA-2019:1873, https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html, https://access.redhat.com/errata/RHSA-2019:3517, https://access.redhat.com/errata/RHSA-2020:0204, https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html, 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/, http://www.securityfocus.com/bid/106253, https://access.redhat.com/errata/RHSA-2019:2696, https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16884, https://patchwork.kernel.org/patch/10733769/, https://patchwork.kernel.org/cover/10733767/