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CVE

CVE-2026-64597

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

CVE-2026-64597

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

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 SMB2closeinit() 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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/037511726228aaf165c7067ff2bfc88eaecdf1f3, https://git.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66a, https://git.kernel.org/stable/c/b18ed621dbfceecea5539848cddcb9272c9a61e1, https://git.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13, https://git.kernel.org/stable/c/f96e1cdcb63ed3321142ff2fcdf784e32cda8fee, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64597.json, https://nvd.nist.gov/vuln/detail/CVE-2026-64597, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00359%
EPSS Percentile
0.28661%
Introduced Version
433042a91f9373241307725b52de573933ffedbf,4f1fffa2376922f3d1d506e49c0fd445b023a28e,6.6.32,0,6.7.0,6.8.0,6.13.0
Fix Available
037511726228aaf165c7067ff2bfc88eaecdf1f3,f96e1cdcb63ed3321142ff2fcdf784e32cda8fee,6.6.145,6.12.96,6.18.39,7.1.4,6.12.100-1~deb12u1,6.12.96-1,1:6.18.39-79.141.amzn2023,1:1.0-0.amzn2023,1:6.12.100-125.179.amzn2023

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