CVE-2026-64385
Received Received - Intake

BaseFortify

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_ioctl() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_ioctl_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-2026-64385
EUVD
EUVD-2026-48929

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 in the Linux kernel involves a double-free issue in the SMB2_ioctl() function. When a response-bearing attempt returns a replayable error, it frees its response buffer. If SMB2_ioctl_init() fails before the next send, cleanup incorrectly frees the previous response buffer again due to stale bookkeeping.

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 SMB client failures during file operations.

Impact Analysis

This vulnerability could lead to system crashes or instability if exploited. It may allow attackers to cause denial-of-service conditions by triggering the double-free, potentially leading to kernel memory corruption or arbitrary code execution.

Mitigation Strategies

Update the Linux kernel to the patched version that resolves this issue. If immediate patching is not possible, avoid using SMB client features or restrict SMB operations until the update is applied.

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