Null pointer dereference in Linux kernel - CVE-2020-15437

Vulnerability identifier: #VU95685

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-15437

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to perform a denial of service (DoS) attack.

The Linux kernel before version 5.8 is vulnerable to a NULL pointer dereference in drivers/tty/serial/8250/8250_core.c:serial8250_isa_init_ports() that allows local users to cause a denial of service by using the p->serial_in pointer which uninitialized.

Linux kernel
openEuler
Ubuntu
kernel-tools-devel
bpftool-debuginfo
bpftool
python3-perf-debuginfo
python3-perf
python2-perf-debuginfo
python2-perf
perf-debuginfo
perf
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-devel
kernel-debugsource
kernel-debuginfo
kernel
linux-image-oem-20.04 (Ubuntu package)
linux-image-5.6.0-1048-oem (Ubuntu package)

Install update from vendor's repository.

kernel-tools-devel - update to 4.19.90-2010.2.0.0046
bpftool-debuginfo - update to 4.19.90-2010.2.0.0046
bpftool - update to 4.19.90-2010.2.0.0046
python3-perf-debuginfo - update to 4.19.90-2010.2.0.0046
python3-perf - update to 4.19.90-2010.2.0.0046
python2-perf-debuginfo - update to 4.19.90-2010.2.0.0046
python2-perf - update to 4.19.90-2010.2.0.0046
perf-debuginfo - update to 4.19.90-2010.2.0.0046
perf - update to 4.19.90-2010.2.0.0046
kernel-tools-debuginfo - update to 4.19.90-2010.2.0.0046
kernel-tools - update to 4.19.90-2010.2.0.0046
kernel-source - update to 4.19.90-2010.2.0.0046
kernel-devel - update to 4.19.90-2010.2.0.0046
kernel-debugsource - update to 4.19.90-2010.2.0.0046
kernel-debuginfo - update to 4.19.90-2010.2.0.0046
kernel - update to 4.19.90-2010.2.0.0046
linux-image-oem-20.04 (Ubuntu package) - update to 5.6.0.1048.44
linux-image-5.6.0-1048-oem (Ubuntu package) - update to 5.6.0-1048.52

• https://lkml.org/lkml/2020/7/21/80

• Null pointer dereference in Linux kernel
• Ubuntu update for linux-oem-5.6
• openEuler 20.03 LTS update for kernel