Buffer overflow in Linux kernel - CVE-2019-18198

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Main Vulnerability Database Vulnerabilities #VU21943

Buffer overflow in Linux kernel - CVE-2019-18198

Published: October 19, 2019


Vulnerability identifier: #VU21943
CSH Severity: Low
CVSS v4: 8.5 [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]
CVE-ID: CVE-2019-18198
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges system.

The vulnerability exists due to a reference count usage error in the fib6_rule_suppress() function in the fib6 suppression feature of net/ipv6/fib6_rules.c within the Linux kernel, when handling the FIB_LOOKUP_NOREF flag. A local user can set the FIB_LOOKUP_NOREF flag, trigge rmemory corruption and execute arbitrary code on the system with elevated privileges.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure (Ubuntu package)
linux-kvm (Ubuntu package)

How to mitigate CVE-2019-18198

Install updates from vendor's repository.

Linux kernel - update to 5.3.4
linux (Ubuntu package) - update to 5.3.0-19.20
linux-aws (Ubuntu package) - update to 5.3.0-1004.4
linux-gcp (Ubuntu package) - update to 5.3.0-1005.5
linux-azure (Ubuntu package) - update to 5.3.0-1004.4
linux-kvm (Ubuntu package) - update to 5.3.0-1004.4

External References

Related Security Bulletins