Null pointer dereference in Linux kernel - CVE-2020-27830
Published: May 13, 2021 / Updated: September 7, 2021
Vulnerability identifier: #VU95192
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-27830
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
A vulnerability was found in Linux Kernel where in the spk_ttyio_receive_buf2() function, it would dereference spk_ttyio_synth without checking whether it is NULL or not, and may lead to a NULL-ptr deref crash.
Remediation
Install update from vendor's repository.
External links
- https://bugzilla.redhat.com/show_bug.cgi?id=1919900
- http://www.openwall.com/lists/oss-security/2020/12/08/1
- http://www.openwall.com/lists/oss-security/2020/12/08/4
- https://www.debian.org/security/2021/dsa-4843
- https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html
- https://security.netapp.com/advisory/ntap-20210625-0004/