Detections
Analytics
CVE-2019-15239
high
Description
In the Linux kernel, a certain net/ipv4/tcp_output.c change, which was properly incorporated into 4.16.12, was incorrectly backported to the earlier longterm kernels, introducing a new vulnerability that was potentially more severe than the issue that was intended to be fixed by backporting. Specifically, by adding to a write queue between disconnection and re-connection, a local attacker can trigger multiple use-after-free conditions. This can result in a kernel crash, or potentially in privilege escalation. NOTE: this affects (for example) Linux distributions that use 4.9.x longterm kernels before 4.9.190 or 4.14.x longterm kernels before 4.14.139.
References
https://www.debian.org/security/2019/dsa-4497
https://pulsesecurity.co.nz/advisories/linux-kernel-4.9-tcpsocketsuaf
https://lore.kernel.org/stable/41a61a2f87691d2bc839f26cdfe6f5ff2f51e472.camel%40decadent.org.uk/
https://access.redhat.com/errata/RHSA-2020:0027
https://access.redhat.com/errata/RHSA-2019:3979
https://access.redhat.com/errata/RHSA-2019:3978
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00066.html
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00064.html