CVE-2026-15812 Kronosnet: kronosnet: access control list bypass via link id spoofing on unencrypted dynamic links
Remote attackers can bypass access controls and inject arbitrary data by spoofing link IDs in unencrypted dynamic links, affecting Kronosnet users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-15812?
CVE-2026-15812 is a medium-severity authentication bypass vulnerability in Red Hat Enterprise Linux 10, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was found in the internal Access Control List (ACL) subsystem of kronosnet (Version affected: <= 1.34). When the framework is explicitly configured to manage dynamic links (accepting network traffic from any IP address) without network payload encryption, the validation architecture implicitly trusts the link ID provided within incoming data packets. A remote, unauthenticated attacker can exploit this lack of validation by spoofing a legitimate link ID inside crafted network frames. This allows the attacker to fully bypass the ACL framework and inject arbitrary data packets into the application layer, potentially leading to data corruption or service instabilities.
Weakness: CWE-290
Which versions are affected by CVE-2026-15812?
How do I fix CVE-2026-15812?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-15812 being exploited?
There is no known exploitation of CVE-2026-15812 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-15812, GHSA-36hw-mpc9-fw23, UBUNTU-CVE-2026-15812.