Out-of-bounds read in Linux kernel - CVE-2020-28097

Vulnerability identifier: #VU70766

CSH Severity: Low

CVSS v4: 5.2 [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]

CVE-ID: CVE-2020-28097

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
openEuler
kernel
kernel-devel
perf
kernel-debugsource
python2-perf
python3-perf-debuginfo
bpftool
python3-perf
bpftool-debuginfo
kernel-source
kernel-tools-devel
kernel-debuginfo
kernel-tools
perf-debuginfo
python2-perf-debuginfo
kernel-tools-debuginfo

Install updates from vendor's website.

Linux kernel - update to 5.8.10
kernel - update to 4.19.90-2107.4.0.0097
kernel-devel - update to 4.19.90-2107.4.0.0097
perf - update to 4.19.90-2107.4.0.0097
kernel-debugsource - update to 4.19.90-2107.4.0.0097
python2-perf - update to 4.19.90-2107.4.0.0097
python3-perf-debuginfo - update to 4.19.90-2107.4.0.0097
bpftool - update to 4.19.90-2107.4.0.0097
python3-perf - update to 4.19.90-2107.4.0.0097
bpftool-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-source - update to 4.19.90-2107.4.0.0097
kernel-tools-devel - update to 4.19.90-2107.4.0.0097
kernel-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-tools - update to 4.19.90-2107.4.0.0097
perf-debuginfo - update to 4.19.90-2107.4.0.0097
python2-perf-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-tools-debuginfo - update to 4.19.90-2107.4.0.0097

• 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/

• Information disclosure in Linux kernel VGA
• openEuler update for kernel