CVE-2026-93824 tls: reject the combination of TLS and sockmap
Local attackers can exploit latent bugs in the Linux kernel TLS and sockmap integration to achieve code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93824?
CVE-2026-93824 is a vulnerability in Linux, published on 24 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
tls: reject the combination of TLS and sockmap
TLS and sockmap (BPF psock) integration hides a lot of latent bugs. Bugs which may be more or less relevant for real users but they are definitely exploitable.
We could not find anyone actively using this integration so let's reject this config. Adding a TLS socket to a sockmap was already rejected by sk_psock_init() through the inet_csk_has_ulp() check. We need to reject the attempts to configure the TLS keys (rather than adding the ULP itself) because checking prior to the ULP installation is tricky without risking a race with sockmap getting added in parallel (sockmap does not hold the socket lock).
This patch is a minimal rejection of the feature. Subsequent patch in the series will do a light dead code removal. Full cleanup would require a major rewrite of the Tx path, we don't need skmsg any more.
Which versions are affected by CVE-2026-93824?
How do I fix CVE-2026-93824?
Apply the vendor's patch.
Is CVE-2026-93824 being exploited?
There is no known exploitation of CVE-2026-93824 in the wild and no public exploit code.
Sources
Also known as AZL-103568, BELL-CVE-2026-93824, DEBIAN-CVE-2026-93824, GHSA-p3wg-3xj5-pf82, UBUNTU-CVE-2026-93824.