Buffer overflow in Linux kernel - CVE-2020-8835
Published: March 31, 2020 / Updated: March 24, 2023
Vulnerability identifier: #VU26466
CSH Severity: Low
CVSS v4.0: 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:P/U:Clear
CVE-ID: CVE-2020-8835
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in bpf verifier for 32 bit systems in Linux kernel. A local user can rigger a buffer overflow and gain access to sensitive information or execute arbitrary code on the system with elevated privileges.
How to mitigate CVE-2020-8835
Install updates from vendor's website.
As a temporary solution set the following sysctl:
kernel.unprivileged_bpf_disabled = 1