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CVE-2026-64597

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

Published: Aug 6, 2026Updated: Aug 8, 2026 Sources: CVE List NVD
9.8CRITICAL
NVD MITRE
EPSS Score
0.4%
Top 70.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Affected Products

Linux
oss-projectaka the linux kernel
LinuxOn-premOS
Operating Systems / linux-distro

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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References

https://git.kernel.org/stable/c/037511726228aaf165c7067ff2bfc88eaecdf1f3
git.kernel.org
https://git.kernel.org/stable/c/0aa97edf7c347c0f54e7e60c4740574b8120c66a
git.kernel.org
https://git.kernel.org/stable/c/d15d83125007f673aec4323e1bbbaaffbe87ea13
git.kernel.org
and 2 more references View all →

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