CVE-2019-15239
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2019-15239
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2019-15239.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 4.15.4-1 |
| debian | bullseye | fixed | 4.15.4-1 |
| debian | forky | fixed | 4.15.4-1 |
| debian | sid | fixed | 4.15.4-1 |
| debian | trixie | fixed | 4.15.4-1 |
References
Verify integrity in audit chain (admin only). AS-IS.