Integer overflow in Linux kernel - CVE-2020-12826

Vulnerability identifier: #VU28168

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-2020-12826

CWE-ID: CWE-190

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow in "exec_id" in "include/linux/sched.h". A local user can pass specially crafted data to the application, trigger integer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Slackware Linux
kernel (Red Hat package)
kernel-rt (Red Hat package)
linux-4.4.227/kernel-generic
linux-4.4.227/kernel-huge
linux-4.4.227/kernel-modules
linux-4.4.227/kernel-headers

Install updates from vendor's website.

Linux kernel - update to 5.6.5
kernel (Red Hat package) - addressed in versions 3.10.0-1160.el7, 4.18.0-240.el8
kernel-rt (Red Hat package) - update to 3.10.0-1160.rt56.1131.el7
linux-4.4.227/kernel-generic - update to 4.4.227
linux-4.4.227/kernel-huge - update to 4.4.227
linux-4.4.227/kernel-modules - update to 4.4.227
linux-4.4.227/kernel-headers - update to 4.4.227_smp

• https://bugzilla.redhat.com/show_bug.cgi?id=1822077
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5
• https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cef
• https://lists.openwall.net/linux-kernel/2020/03/24/1803
• https://www.openwall.com/lists/kernel-hardening/2020/03/25/1

• Multiple vulnerabilities in Linux kernel
• Amazon Linux AMI update for kernel
• Slackware Linux update for kernel
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 7 update for kernel-rt
• Red Hat Enterprise Linux 7 update for kernel