Riskcovery

CVE-2026-64597

smb: client: fix double-free in SMB2_close() replay

State
Published
Severity
9.8 Critical
Published
Aug 6, 2026
Updated
Oct 19, 2026
Reserved
Jul 19, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix double-free in SMB2_close() replay

A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_close_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

CVSSScoreVectorSource
3.19.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • 433042a91f9373241307725b52de573933ffedbf to before 037511726228aaf165c7067ff2bfc88eaecdf1f3Affected
  • 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before 0aa97edf7c347c0f54e7e60c4740574b8120c66aAffected
  • 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before d15d83125007f673aec4323e1bbbaaffbe87ea13Affected
  • 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before b18ed621dbfceecea5539848cddcb9272c9a61e1Affected
  • 4f1fffa2376922f3d1d506e49c0fd445b023a28e to before f96e1cdcb63ed3321142ff2fcdf784e32cda8feeAffected
  • 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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