A vulnerability was found in 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. Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7f582b248d0a86bae5788c548d7bb5bca6f7691a https://lore.kernel.org/stable/41a61a2f87691d2bc839f26cdfe6f5ff2f51e472.camel@decadent.org.uk/
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1747354]
Fedora was not vulnerable to this as it never used the long term stable kernels and had the proper fix from 4.16.12
Statement: This issue affected Red Hat Enterprise Linux 7 starting with kernel version kernel-3.10.0-1053.el7. The first publicly available affected kernel version is kernel-3.10.0-1062.el7 released via https://access.redhat.com/errata/RHSA-2019:2029, the Red Hat Enterprise Linux 7.7 GA kernel errata release.
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:3979 https://access.redhat.com/errata/RHSA-2019:3979
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:3978 https://access.redhat.com/errata/RHSA-2019:3978
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2019-15239
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:0027 https://access.redhat.com/errata/RHSA-2020:0027