CVE-2026-46026
Analyzed Analyzed - Analysis Complete
Linux Kernel QRTR Lookup Flooding Vulnerability

Publication date: 2026-05-27

Last updated on: 2026-06-16

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: net: qrtr: ns: Limit the maximum number of lookups Current code does no bound checking on the number of lookups a client can perform. Though the code restricts the lookups to local clients, there is still a possibility of a malicious local client sending a flood of NEW_LOOKUP messages over the same socket. Fix this issue by limiting the maximum number of lookups to 64 globally. Since the nameserver allows only atmost one local observer, this global lookup count will ensure that the lookups stay within the limit. Note that, limit of 64 is chosen based on the current platform requirements. If requirement changes in the future, this limit can be increased.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-05-27
Last Modified
2026-06-16
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-46026
EUVD
EUVD-2026-32407
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
linux linux_kernel From 6.7 (inc) to 6.12.86 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.27 (exc)
linux linux_kernel From 6.19 (inc) to 7.0.4 (exc)
linux linux_kernel From 5.7 (inc) to 6.6.140 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability exists in the Linux kernel's qrtr nameserver (ns) component, where there is no limit on the number of lookup requests a local client can perform.

A malicious local client could exploit this by sending a flood of NEW_LOOKUP messages over the same socket, potentially overwhelming the system.

The fix involves limiting the maximum number of lookups globally to 64, ensuring that the number of lookups stays within a controlled limit.

Impact Analysis

If exploited, this vulnerability could allow a malicious local client to flood the nameserver with excessive lookup requests.

This could lead to resource exhaustion or denial of service conditions on the affected system, potentially impacting system stability or availability.

Mitigation Strategies

To mitigate this vulnerability, ensure that your Linux kernel is updated to a version that includes the fix limiting the maximum number of lookups to 64 globally in the qrtr nameserver code.

This fix prevents malicious local clients from flooding the system with NEW_LOOKUP messages by enforcing a global lookup count limit.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-46026. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart