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Fencer Vulns
medium 6.5

CVE-2026-15813 json

Kronosnet: kronosnet: memory corruption and out-of-bounds access via malformed network packet defragmentation

published 2026-07-20 3 mo ago modified 2026-11-05 3 d ago also EUVD-2026-45899

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

A vulnerability was found in the network packet de-fragmentation engine of kronosnet (Version affected <= 1.34). The internal reassembly code does not properly validate sequence numbers of incoming payload fragments. An attacker can exploit this lack of verification by transmitting malformed packets with corrupted sequence parameters. Under specific conditions, this forces the packet processing layer to parse data outside the designated bounds of the internal memory structures, causing an out-of-bounds memory access or heap corruption. This behavior can result in sudden application crashes or system instability.

Patch / fix

  • kronosnet Debian 14 1.35-1

debian advisories DEBIAN-CVE-2026-15813

  • 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-2026-15813 updated cvss 6.5

kronosnet: kronosnet: memory corruption and out-of-bounds access via malformed network packet defragmentation

  • 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

0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

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

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.