Out-of-bounds read in Linux kernel - CVE-2020-28097
Published: January 6, 2023
Vulnerability identifier: #VU70766
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-28097
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows an attacker with physical access to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition in the Linux kernel’s implementation of the invert video code on VGA consoles. A local user with access to the VGA console can scroll the console, calling an ioctl TIOCL_SCROLLCONSOLE to crash the system, potentially reading random out-of-bound memory on the system.
How to mitigate CVE-2020-28097
Install updates from vendor's website.
Sources
- https://github.com/torvalds/linux/commit/973c096f6a85e5b5f2a295126ba6928d9a6afd45
- https://seclists.org/oss-sec/2020/q3/176
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.10
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=973c096f6a85e5b5f2a295126ba6928d9a6afd45
- https://security.netapp.com/advisory/ntap-20210805-0001/