CVE-2026-43239
Undergoing Analysis Undergoing Analysis - In Progress
Kernel Race Condition in SMB Client Component

Publication date: 2026-05-06

Last updated on: 2026-05-08

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: prevent races in ->query_interfaces() It was possible for two query interface works to be concurrently trying to update the interfaces. Prevent this by checking and updating iface_last_update under iface_lock.
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Meta Information
Published
2026-05-06
Last Modified
2026-05-08
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-43239
EUVD
EUVD-2026-27800
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux linux_kernel *
linux_kernel linux_kernel *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's SMB client implementation. It involves a race condition in the function responsible for querying interfaces (->query_interfaces()). Specifically, two concurrent query interface operations could attempt to update the interfaces at the same time, leading to potential inconsistencies or unexpected behavior.

The issue was resolved by adding a mechanism to check and update the iface_last_update variable while holding a lock (iface_lock), preventing concurrent updates and thus eliminating the race condition.

Impact Analysis

This vulnerability could lead to race conditions when multiple SMB client queries attempt to update interface information simultaneously. Such race conditions might cause inconsistent or corrupted interface data, potentially resulting in unexpected behavior or instability in SMB client operations on affected Linux systems.

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