CVE-2026-64384

smb: client: fix change notify replay double-free

State: Published
Severity: 9.8 Critical
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 change notify replay double-free

A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_notify_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	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-415 Double Free

Affected Products

Product	Versions
LinuxLinux	433042a91f9373241307725b52de573933ffedbf to before 5821f9dbb8b5b24391850a13418e633edd0fb003Affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before d684f4134998085702009b94c35c2003fc9e72d3Affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 52af1975f0dfae990c5a0e85872cc41be0e88a68Affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 901891513951bc8322ece754863909ea45af95c6Affected 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 145f820dcbb2cced374f2532f8a61a44dce4a615Affected 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 5821f9dbb8b5b24391850a13418e633edd0fb003Affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e to before d684f4134998085702009b94c35c2003fc9e72d3Affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 52af1975f0dfae990c5a0e85872cc41be0e88a68Affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 901891513951bc8322ece754863909ea45af95c6Affected
4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 145f820dcbb2cced374f2532f8a61a44dce4a615Affected
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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