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OpenAdvisories
Medium · 4.8 CVE-2026-15812 EUVD-2026-46152GHSA-36hw-mpc9-fw23

Kronosnet: kronosnet: access control list bypass via link id spoofing on unencrypted dynamic links

Published Jul 21, 2026 · Updated Nov 6, 2026 · Assigned by redhat

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

VendorProductAffectedFixed
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.

ReleasePackageFixed inAdvisory
Debian 14 kronosnet 1.35-1 —
Debian 13 kronosnet No fix yet —
Debian 12 kronosnet No fix yet —
ReleasePackageFixed inAdvisory
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)
ReleasePackageFixed inAdvisory
Ubuntu 18.04 LTS kronosnet No fix yet —
ReleasePackageFixed inAdvisory
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
ReleasePackageFixed inAdvisory
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

References