Vulnerability · Published Jul 21, 2026 · Assigned by redhat
CVE-2026-15812Kronosnet: kronosnet: access control list bypass via link id spoofing on unencrypted dynamic links
Medium 4.8
In plain English
A medium-severity authentication bypass by spoofing in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | kronosnet | no fix listed | DEBIAN-CVE-2026-15812 |
| Debian:13 | kronosnet | no fix listed | DEBIAN-CVE-2026-15812 |
| Debian:14 | kronosnet | 1.35-1 | DEBIAN-CVE-2026-15812 |
| Ubuntu:22.04:LTS | kronosnet | no fix listed | UBUNTU-CVE-2026-15812 |
| Ubuntu:24.04:LTS | kronosnet | no fix listed | UBUNTU-CVE-2026-15812 |
| Ubuntu:26.04:LTS | kronosnet | no fix listed | UBUNTU-CVE-2026-15812 |
| Ubuntu:26.10 | kronosnet | no fix listed | UBUNTU-CVE-2026-15812 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
Weakness: CWE-290 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
References
- https://access.redhat.com/security/cve/CVE-2026-15812 vdb-entry, x_refsource_REDHAT
- RHBZ#2500851 issue-tracking, x_refsource_REDHAT