Review reviewCritical

CVE-2026-64386

Linux

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix query_info() replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_query_info_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 < 100fb7c455fa86d248b8bd7bb9de757c192870b4, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 3c81dda84799f76b42aec598564316e2964440db, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < f1add4acb656f5a82806a1ab0e63fed3d8b1bfca, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 89234773e8348918111aa15f6922b58cf3843364, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 2a88561d66eb855813cf004a0abe648bbb17de5e, >= 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