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Fencer Vulns
medium 4.8

CVE-2026-15812 json

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

published 2026-07-21 3 mo ago modified 2026-11-06 2 d ago also EUVD-2026-46152

cvss
4.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 17%
public exploits
0
none known

Summary

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.

Patch / fix

  • kronosnet Debian 14 1.35-1

debian advisories DEBIAN-CVE-2026-15812

  • kronosnet SLE High Availability Extension 16.0, SLES for SAP applications 16.0 1.30-160000.4.1
  • rpm Linux Micro Extras 6.2 4.20.1-160000.3.1
  • kernel-livepatch-SLE16-RT_Update_15 Linux Micro 6.2 3-160000.1.1

suse advisories SUSE-SU-2026:23782-1SUSE-SU-2026:23792-1

  • kronosnet openSUSE Leap 16.0 1.30-160000.4.1
  • kronosnet openSUSE Tumbleweed 1.33-2.1

opensuse advisories openSUSE-SU-2026:21851-1openSUSE-SU-2026:11364-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-15812 updated cvss 4.8

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

  • Red Hat Enterprise Linux 8 libknet1, libnozzle1, libknet1-plugins-all, libknet1-crypto-nss-plugin, libknet1-crypto-plugins-all, libknet1-compress-lz4-plugin, +6 more Red Hat Enterprise Linux 9 libknet1, libnozzle1, libknet1-plugins-all, libknet1-crypto-nss-plugin, libknet1-crypto-plugins-all, libknet1-compress-lz4-plugin, +7 more Red Hat Enterprise Linux 10 kronosnet Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Affected products

  • 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

Classification

Weakness
  • CWE-290 Authentication Bypass by Spoofing

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.