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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | kronosnet | 1.35-1 | — |
| Debian 13 | kronosnet | No fix yet | — |
| Debian 12 | kronosnet | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | kronosnet | No fix yet | — |
| Ubuntu 26.04 LTS | kronosnet | No fix yet | — |
| Ubuntu 24.04 LTS | kronosnet | No fix yet | — |
| Ubuntu 22.04 LTS | kronosnet | No fix yet | — |
| Ubuntu 20.04 LTS | kronosnet | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | kronosnet | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | kronosnet | 1.30-160000.4.1 | SUSE-SU-2026:23792-1 |
| SLES 16.0 | kronosnet | 1.30-160000.4.1 | SUSE-SU-2026:23782-1 |
| SLE Micro 6.2 | kernel-livepatch-SLE16-RT_Update_15 | 3-160000.1.1 | SUSE-SU-2026:23792-1 |
| SLE Micro 6.2 | rpm | 4.20.1-160000.3.1 | SUSE-SU-2026:23782-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kronosnet | 1.33-2.1 | openSUSE-SU-2026:11364-1 |
| openSUSE Leap 16.0 | kronosnet | 1.30-160000.4.1 | openSUSE-SU-2026:21851-1 |
Advisories 4
- SUSE-SU-2026:23792-1 Security update for kronosnet SUSE / openSUSE Security Updates · Sep 27, 2026
- SUSE-SU-2026:23782-1 Security update for kronosnet SUSE / openSUSE Security Updates · Sep 27, 2026
- openSUSE-SU-2026:21851-1 Security update for kronosnet SUSE / openSUSE Security Updates · Sep 17, 2026
- openSUSE-SU-2026:11364-1 libknet-devel-1.33-2.1 on GA media SUSE / openSUSE Security Updates · Jul 25, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-15812 vdb-entry
- RHBZ#2500851 issue-tracking