Critical severity · published Jul 25, 2026
CVE-2026-64386
smb: client: fix query_info() replay double-free
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix query_info() replay double-free
A response-bearing attempt can return a replayable error and free its
response buffer. If SMB2_query_info_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 100fb7c455fa86d248b8bd7bb9de757c192870b4; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 3c81dda84799f76b42aec598564316e2964440db; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before f1add4acb656f5a82806a1ab0e63fed3d8b1bfca; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 89234773e8348918111aa15f6922b58cf3843364; 4f1fffa2376922f3d1d506e49c0fd445b023a28e before 2a88561d66eb855813cf004a0abe648bbb17de5e; 6.6.32 before 6.6.145; +1 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64386
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-64386
Patch
https://git.kernel.org/stable/c/100fb7c455fa86d248b8bd7bb9de757c192870b4
Patch
https://git.kernel.org/stable/c/2a88561d66eb855813cf004a0abe648bbb17de5e
Patch
https://git.kernel.org/stable/c/3c81dda84799f76b42aec598564316e2964440db
Patch
https://git.kernel.org/stable/c/89234773e8348918111aa15f6922b58cf3843364
Patch
https://git.kernel.org/stable/c/f1add4acb656f5a82806a1ab0e63fed3d8b1bfca
More from Kernel
9.8
CVE-2025-39682
tls: fix handling of zero-length records on the rx_list
8.8
CVE-2026-53266
netfilter: bridge: make ebt_snat ARP rewrite writable
8.8
CVE-2013-6282
Linux Kernel Improper Input Validation Vulnerability
8.4
CVE-2022-0185
Linux Kernel Heap-Based Buffer Overflow Vulnerability
8.4
CVE-2013-2094
Linux Kernel Privilege Escalation Vulnerability