Privilege escalation in Linux kernel - CVE-2015-5157

Vulnerability identifier: #VU2590

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2015-5157

CWE-ID: CWE-264

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists in arch/x86/entry/entry_64.S on the x86_64 platform due to mishandling of IRET faults in processing NMIs that occurred during userspace execution. A local attacker can trigger NMI and bypass security restrictions.

Linux kernel
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Server from RHUI
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support from RHUI
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support

MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)

Update to version 4.1.6.

kernel (Red Hat package) - addressed in versions 2.6.32-573.26.1.el6, 3.10.0-327.10.1.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-327.rt56.171.el6rt, 3.10.0-327.10.1.rt56.211.el7_2

• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.1.6

• Multiple vulnerabilities in Linux Kernel
• Red Hat update for kernel
• Red Hat update for kernel-rt
• Red Hat update for kernel-rt
• Red Hat update for kernel