CVE-2026-46026

Analyzed Analyzed - Analysis Complete

Linux Kernel QRTR Lookup Flooding Vulnerability

Publication date: 2026-05-27

Last updated on: 2026-06-19

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

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Meta Information

Published

2026-05-27

Last Modified

2026-06-19

Generated

2026-07-06

AI Q&A

2026-05-27

EPSS Evaluated

2026-07-05

NVD

CVE-2026-46026

EUVD

EUVD-2026-32407

Affected Vendors & Products

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

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

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.

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