CVE-2026-64382

smb: client: fix double-free in SMB2_open() replay

State: Published
Severity: 8.8 High
Published: Jul 25, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-415 Double Free

Affected Products

Product	Versions
LinuxLinux	433042a91f9373241307725b52de573933ffedbf to before 02bc2896bdc3e29362d6e40d404006944a159c25Affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 3196b5192f246df4272072f61a2f4a3e9967f55dAffected 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 14498ff5ce0f272ce0ef988721413e06b7038972Affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before ff2d30927bc3bf3c629f0768d2068096e64ef5ceAffected 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before b55e182f2324bc6a604c21a47aa6c448f719a532Affected 6.6.32 to before 6.6.145Affected
LinuxLinux	6.8Affected before 6.8Not affected 6.6.145 through 6.6.Not affected 6.12.96 through 6.12.Not affected 6.18.39 through 6.18.Not affected 7.1.4 through 7.1.Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

433042a91f9373241307725b52de573933ffedbf to before 02bc2896bdc3e29362d6e40d404006944a159c25Affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 3196b5192f246df4272072f61a2f4a3e9967f55dAffected
4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 14498ff5ce0f272ce0ef988721413e06b7038972Affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e to before ff2d30927bc3bf3c629f0768d2068096e64ef5ceAffected
4f1fffa2376922f3d1d506e49c0fd445b023a28e to before b55e182f2324bc6a604c21a47aa6c448f719a532Affected
6.6.32 to before 6.6.145Affected

LinuxLinux

6.8Affected
before 6.8Not affected
6.6.145 through 6.6.*Not affected
6.12.96 through 6.12.*Not affected
6.18.39 through 6.18.*Not affected
7.1.4 through 7.1.*Not affected
7.2 and laterNot affected

References

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