CVE-2026-68343
Received Received - Intake

Linux Kernel DFS PathConsumed Validation Flaw

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: validate DFS referral PathConsumed parse_dfs_referrals() validates that the response contains the fixed referral entry array and, on for-next, the per-referral string offsets. However, the response also contains a PathConsumed value that is later used for DFS path parsing. If a malformed response provides a PathConsumed value larger than the search name, later DFS parsing can advance beyond the end of the path. Validate PathConsumed against the search name length before storing it in the parsed referral.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68343
EUVD
EUVD-2026-55444

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves improper validation of the PathConsumed value in SMB DFS referral responses. A malformed response could set PathConsumed larger than the search name length, causing later path parsing to exceed the path's bounds and potentially lead to memory corruption or crashes.

Detection Guidance

This vulnerability affects the Linux kernel's SMB client DFS referral handling. Detection requires checking kernel logs for SMB-related errors or crashes during DFS operations. Monitor for kernel oops messages or system hangs when accessing SMB shares. No specific commands are provided in the context.

Impact Analysis

If exploited, this flaw could allow attackers to crash the system or execute arbitrary code with kernel privileges by sending a specially crafted SMB DFS referral response. This could lead to denial of service or unauthorized access to sensitive data on affected systems.

Mitigation Strategies

Apply the latest Linux kernel security patches that address this issue. If patches are unavailable, disable SMB DFS client functionality by unmounting DFS shares or configuring the kernel to reject malformed SMB responses. Monitor vendor advisories for updates.

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