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Review reviewCritical

CVE-2026-64383

Linux

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time. Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful req...

CVSS
9.8
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 9.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix double-free in SMB2_flush() replay SMB2_flush() keeps its response buffer bookkeeping across replay attempts. If a replayable flush response is received and the retry then fails before cifs_send_recv() stores a replacement response, flush_exit will free the stale response pointer a second time. Reinitialize resp_buftype and rsp_iov at the top of the replay loop so cleanup only acts on response state produced by the current attempt. This fixes a double-free without changing replay handling for successful req...

Affected product and versions

Product
Linux
Affected versions
>= 433042a91f9373241307725b52de573933ffedbf < 6e27f40b682a5e42a2daae3ce6d96f0e0e16dedb, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 878757163eea684750107a31ea134c103863515d, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 3407240cde132a4b72d6429a2625a09a2f78adaf, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 013a9a3da46c5dabcf18f65ea6a47874ba12a15d, >= 4f1fffa2376922f3d1d506e49c0fd445b023a28e < 4be31c943a3a27a5a0251dbb8f5cb89059ec3d5a, >= 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:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-64383 — Linux | SECUFOCUS NOW