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Review reviewHigh

CVE-2026-64382

Linux

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.

CVSS
8.8
EPSS
-
- percentile
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 8.8

Vulnerability overview

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.

Affected product and versions

Product
Linux
Affected versions
>= 433042a91f9373241307725b52de573933ffedbf < 02bc2896bdc3e29362d6e40d404006944a159c25, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 3196b5192f246df4272072f61a2f4a3e9967f55d, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 14498ff5ce0f272ce0ef988721413e06b7038972, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < ff2d30927bc3bf3c629f0768d2068096e64ef5ce, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < b55e182f2324bc6a604c21a47aa6c448f719a532, >= 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. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 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:R/S:U/C:H/I:H/A:H
CWE
Not available