High severity · published Jul 25, 2026
CVE-2026-64382
smb: client: fix double-free in SMB2_open() replay
8.8
CVSS
0.4%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
6.6.32 before 6.6.145; 6.8.1 before 6.12.96; 6.13 before 6.18.39; 6.19 before 7.1.4; 6.8; 6.8; +5 more · source: NVD
LI
Linux · Linux
433042a91f9373241307725b52de573933ffedbf before 02bc2896bdc3e29362d6e40d404006944a159c25; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 3196b5192f246df4272072f61a2f4a3e9967f55d; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 14498ff5ce0f272ce0ef988721413e06b7038972; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before ff2d30927bc3bf3c629f0768d2068096e64ef5ce; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before b55e182f2324bc6a604c21a47aa6c448f719a532; 6.6.32 before 6.6.145; +1 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64382
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-64382
Patch
https://git.kernel.org/stable/c/02bc2896bdc3e29362d6e40d404006944a159c25
Patch
https://git.kernel.org/stable/c/14498ff5ce0f272ce0ef988721413e06b7038972
Patch
https://git.kernel.org/stable/c/3196b5192f246df4272072f61a2f4a3e9967f55d
Patch
https://git.kernel.org/stable/c/b55e182f2324bc6a604c21a47aa6c448f719a532
Patch
https://git.kernel.org/stable/c/ff2d30927bc3bf3c629f0768d2068096e64ef5ce
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