CVE-2026-64382
Received Received - Intake

Double-Free in Linux Kernel SMB Client

Publication date: 2026-07-25

Last updated on: 2026-07-25

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_open() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_open_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.

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Meta Information

Published
2026-07-25
Last Modified
2026-07-25
Generated
2026-07-25
AI Q&A
2026-07-25
EPSS Evaluated
N/A
NVD
CVE-2026-64382
EUVD
EUVD-2026-48926

Affected Vendors & Products

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

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a double-free issue in the Linux kernel's SMB client implementation. It occurs in the SMB2_open() function during replay scenarios. When an error response is processed, the response buffer is freed. If a subsequent operation fails before sending, the cleanup process incorrectly frees the same buffer again, leading to a double-free condition.

Detection Guidance

This vulnerability is specific to the Linux kernel's SMB client implementation and may not have direct detection commands. Monitor kernel logs for SMB-related errors or crashes after applying updates. Check for kernel panics or smbd service failures.

Impact Analysis

This vulnerability could lead to kernel memory corruption or crashes, potentially causing system instability or denial-of-service conditions. If exploited, it might allow unauthorized access or privilege escalation on affected systems running the vulnerable Linux kernel version.

Mitigation Strategies

Update the Linux kernel to the patched version that resolves this issue. If immediate patching is not possible, consider disabling SMB client functionality temporarily or restricting SMB network access until the update is applied.

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