Information disclosure in Linux kernel - CVE-2018-15594

Vulnerability identifier: #VU14495

CSH Severity: Low

CVSS v4: 5.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-15594

CWE-ID: CWE-200

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows an adjacent attacker to conduct Spectre version 2 (Spectre-v2) attacks.

The vulnerability exists in the arch/x86/kernel/paravirt.c source code file due to improper handling of indirect calls to CALLEE_SAVE paravirtual functions. A remote attacker can access the system and execute an application that submits malicious input to access sensitive information, which could be used to conduct additional attacks. 

Linux kernel
Amazon Linux AMI
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 Real Time for NFV
Red Hat Enterprise Linux for Real Time

kernel (Red Hat package)
kernel-rt (Red Hat package)
Red Hat Virtualization Host

Update to version 4.18.1.

Linux kernel - update to 4.18.1
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

• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.1

• Red Hat update for kernel-rt
• Red Hat update for kernel
• Amazon Linux AMI update for kernel