CVE-2026-15813
Received Received - Intake

kronosnet Network Packet Fragmentation Sequence Validation Flaw

Publication date: 2026-07-20

Last updated on: 2026-07-20

Assigner: Red Hat, Inc.

Description
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.

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Meta Information

Published
2026-07-20
Last Modified
2026-07-20
Generated
2026-07-21
AI Q&A
2026-07-20
EPSS Evaluated
N/A
NVD
CVE-2026-15813
EUVD
EUVD-2026-45899

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
kronosnet kronosnet to 1.34 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

CVE-2026-15813 is a flaw in kronosnet's network packet defragmentation engine affecting versions up to 1.34. The vulnerability occurs because the system does not properly validate sequence numbers of incoming packet fragments. Attackers can send malformed packets with corrupted sequence parameters, causing the system to access memory outside allocated bounds. This leads to out-of-bounds memory access or heap corruption, potentially crashing the application or causing system instability.

Detection Guidance

Monitor kronosnet logs for crashes or memory corruption errors during packet processing. Use network traffic analyzers like tcpdump or Wireshark to inspect fragmented packets for malformed sequence numbers or overlapping fragments. Enable debug logging in kronosnet if available to trace defragmentation errors.

Impact Analysis

This vulnerability can cause sudden application crashes or system instability by corrupting memory during packet processing. In some cases, it may allow denial-of-service conditions by crashing the kronosnet process. If heap layouts are favorable, it could potentially enable arbitrary code execution within the daemon's context, though this is less likely.

Compliance Impact

This vulnerability primarily causes denial-of-service conditions by crashing the kronosnet process or system instability due to memory corruption. It does not directly impact data confidentiality or integrity, which are key focus areas for GDPR and HIPAA. However, repeated crashes could disrupt services handling sensitive data, potentially leading to compliance issues if availability is compromised.

Mitigation Strategies

Update kronosnet to the latest patched version (>= 1.35) immediately. If updating is not possible, restrict network access to kronosnet ports or disable fragmented packet handling temporarily. Monitor system stability and restart affected services after applying mitigations.

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