Use-after-free error in Linux kernel - CVE-2018-14734

Vulnerability identifier: #VU14181

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-14734

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to the ucma_leave_multicast() function, as defined in the drivers/infiniband/core/ucma.c source code file of the affected software, could allow access to a certain data structure after it has been allocated and freed in the ucma_process_join() function. A local attacker can send a specially request that submits malicious input, trigger use-after-free error and cause the service to crash.

Linux kernel
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Real Time
Fedora
Opensuse

kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-alt (Red Hat package)
kernel-headers
kernel
kernel-tools
Red Hat Virtualization Host

Install update from vendor's website.

kernel (Red Hat package) - update to 3.10.0-1062.el7
kernel-rt (Red Hat package) - update to 3.10.0-1062.rt56.1022.el7
kernel-alt (Red Hat package) - update to 4.14.0-115.7.1.el7a
kernel-headers - addressed in versions 4.17.12-1.fc27, 4.17.12-1.fc28
kernel - addressed in versions 4.17.12-100.fc27, 4.17.12-200.fc28
kernel-tools - addressed in versions 4.17.12-100.fc27, 4.17.12-200.fc28

• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cb2595c1393b4a5211534e6f0a0fbad369e21ad8

• Multiple vulnerabilities in Linux Kernel
• Red Hat update for kernel-rt
• Red Hat update for kernel-alt
• Red Hat update for kernel
• OpenSUSE Linux update for the Linux Kernel
• Fedora 28 update for kernel, kernel-headers, kernel-tools
• Fedora 27 update for kernel, kernel-headers, kernel-tools