Memory corruption in Linux kernel - CVE-2018-18445

Vulnerability identifier: #VU15433

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-18445

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists in the adjust_scalar_min_max_vals function, as defined in the kernel/bpf/verifier.c source code file due to boundary error in the BPF verifier. A local attacker can trigger the BPF verifier to mishandle 32-bit right shifts and cause an out-of-bounds memory access condition to access sensitive information, escalate privileges, or cause a DoS condition on the targeted system.

Linux kernel
Arch Linux
Red Hat Enterprise Linux Desktop
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 Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - 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 for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Opensuse
Red Hat Virtualization Host
kernel (Red Hat package)
kernel-rt (Red Hat package)

Update to version 4.18.13.

Linux kernel - update to 4.18.13
kernel (Red Hat package) - update to 3.10.0-957.10.1.el7
kernel-rt (Red Hat package) - update to 3.10.0-957.10.1.rt56.921.el7

• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.13

• Privilege escalation in Linux Kernel
• Arch Linux update for Linux
• Arch Linux update for Linux
• Arch Linux update for linux-lts
• OpenSUSE Linux update for the Linux Kernel
• Red Hat Enterprise Linux 7 update for kernel-rt
• Red Hat Enterprise Linux 7 update for kernel