Use-after-free error in Linux kernel - CVE-2018-16884

Vulnerability identifier: #VU16616

CSH Severity: Low

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-16884

CWE-ID: CWE-416

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to bc_svc_process() use wrong back-channel id when NFS41+ shares mounted in different network namespaces at the same time. A remote attacker can use a malicious container to trigger use-after-free error and cause a system panic.

Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Fedora
Opensuse

MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
kernel-alt (Red Hat package)
kernel
kernel-headers
kernel-tools

Install update from vendor's website.

kernel (Red Hat package) - addressed in versions 3.10.0-693.58.1.el7, 4.18.0-80.15.1.el8_0
kernel-rt (Red Hat package) - addressed in versions 3.10.0-693.58.1.rt56.652.el6rt, 4.18.0-147.rt24.93.el8
kernel-alt (Red Hat package) - update to 4.14.0-115.26.1.el7a
kernel - update to 4.19.16-200.fc28
kernel-headers - update to 4.19.16-200.fc28
kernel-tools - update to 4.19.16-200.fc28

• https://patchwork.kernel.org/cover/10733767/
• https://patchwork.kernel.org/patch/10733769/

• Multiple vulnerabilities in Linux Kernel
• Amazon Linux AMI update for kernel
• Red Hat update for kernel-rt
• Red Hat update for kernel
• OpenSUSE Linux update for the Linux Kernel
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions update for kernel
• Fedora 28 update for kernel, kernel-headers, kernel-tools
• Red Hat Enterprise Linux 7 update for kernel-alt