CVE-2026-64383 Details
Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time. Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful requests.
A double-free vulnerability has been identified in the Linux kernel's SMB2 client implementation. This issue arises in the response replay handling of the SMB2_flush() function. When a replayable flush response is received, and the subsequent retry fails before the response can be replaced, the function inadvertently frees the same response pointer twice. This vulnerability affects the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel stable tree, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/013a9a3da46c5dabcf18f65ea6a47874ba12a15d | kernel.org | Patch |
| https://git.kernel.org/stable/c/3407240cde132a4b72d6429a2625a09a2f78adaf | kernel.org | Patch |
| https://git.kernel.org/stable/c/4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a | kernel.org | Patch |
| https://git.kernel.org/stable/c/6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb | kernel.org | Patch |
| https://git.kernel.org/stable/c/878757163eea684750107a31ea134c103863515d | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-415 | Double Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.6.32, < 6.6.145 >= 6.8.1, < 6.12.96 >= 6.13, < 6.18.39 >= 6.19, < 7.1.4 6.8 - 6.8 rc2 6.8 rc3 6.8 rc4 6.8 rc5 6.8 rc6 6.8 rc7 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 4, 2026 | Initial Analysis | [email protected] |
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 27, 2026 | CVE Modified | kernel.org |
| Jul 25, 2026 | New CVE Received | kernel.org |