#VU28168 Integer overflow in Linux kernel - CVE-2020-12826

Vulnerability identifier: #VU28168

Vulnerability risk: Low

CVSSv4.0: 5.9 [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/E:U/U:Clear]

CVE-ID: CVE-2020-12826

CWE-ID: CWE-190

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.6 - 5.6.4

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External links
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

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.