Critical severity · published Jul 25, 2026
CVE-2026-64385
smb: client: fix double-free in SMB2_ioctl() replay
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix double-free in SMB2_ioctl() replay
A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_ioctl_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:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% 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 0be4bc64882edaefaaee8d1e27d083643eb778e6; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 96fcfc8ae7359346156e492ca610e830d2649ad6; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 276c8efbc49f9303ac76d0d4deab7128581b0f3b; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before fc65ffb4ef1bf540da16b17c225ae51091e07d72; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9; 6.6.32 before 6.6.145; +1 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64385
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-64385
Patch
https://git.kernel.org/stable/c/0be4bc64882edaefaaee8d1e27d083643eb778e6
Patch
https://git.kernel.org/stable/c/276c8efbc49f9303ac76d0d4deab7128581b0f3b
Patch
https://git.kernel.org/stable/c/96fcfc8ae7359346156e492ca610e830d2649ad6
Patch
https://git.kernel.org/stable/c/f9bbadb6c94583e3b4af1afc449bfceb1d1ddec9
Patch
https://git.kernel.org/stable/c/fc65ffb4ef1bf540da16b17c225ae51091e07d72
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