Review reviewCritical

CVE-2026-64384

Linux

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.

CVSS: 9.8
EPSS: -
CISA KEV: Not listed
Published: 2026.07.25

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= 433042a91f9373241307725b52de573933ffedbf < 5821f9dbb8b5b24391850a13418e633edd0fb003, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < d684f4134998085702009b94c35c2003fc9e72d3, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 52af1975f0dfae990c5a0e85872cc41be0e88a68, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 901891513951bc8322ece754863909ea45af95c6, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 145f820dcbb2cced374f2532f8a61a44dce4a615, >= 6.6.32 < 6.6.145, >= 6.8
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: Not available