4.8

CVE-2026-15812: Kronosnet: kronosnet: access control list bypass via link id spoofing on unencrypted dynamic links

Awaiting analysis
AliasesUBUNTU-CVE-2026-15812DEBIAN-CVE-2026-15812
Published 21-07-2026Last modified 21-08-2026

Vulnerability summary

CVE-2026-15812 is a medium (CVSS 4.8) Authentication Bypass by Spoofing vulnerability in kronosnet. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.26%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 4
MGASA-2026-0546OPENSUSE-SU-2026:11364-1OPENSUSE-SU-2026:21851-1SUSE-SU-2026:23782-1SUSE-SU-2026:23792-1

Timeline

  1. 21-07-2026
    PublishedVulnerability first disclosed.
  2. 21-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.26% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • kronosnetAll versions (No fix recorded) | < 1.35-1
Ubuntu1 product
  • kronosnetAll versions (No fix recorded)

2 vendors · 2 products

References

5 links