CVE-2019-15239

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 4.9.190 Linux kernel versions prior to 4.14.139

Description The issue is related to a change in the net/ipv4/tcp output.c component of the Linux kernel, which was incorrectly backported to earlier longterm kernels. This introduced a new vulnerability that can be exploited by a local attacker to trigger multiple use-after-free conditions by adding to a write queue between disconnection and re-connection. This can result in a kernel crash or potentially in privilege escalation.

Recommendations For Linux kernel versions prior to 4.9.190, update to version 4.9.190 or later to resolve the issue. For Linux kernel versions prior to 4.14.139, update to version 4.14.139 or later to resolve the issue. As a temporary workaround, consider restricting access to the net/ipv4/tcp output.c component to minimize the risk of exploitation.