Critical severity · published Apr 24, 2026
CVE-2026-31609
smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
9.8
CVSS
0.5%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
smbd_send_batch_flush() already calls smbd_free_send_io(),
so we should not call it again after smbd_post_send()
moved it to the batch list.
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
before 6.18.24; 6.19 before 6.19.14; 7.0 before 7.0.1 · source: NVD
LI
Linux · Linux
cca0526ef2344cab6944d7f441fc24e152da031b before a9940dcbe5cb92482c04efc7341039ddf7dbf607; 37b5c06956183b65e6808b509cf637632016cdf7 before 22b7c1c619d808aec4cad3dc42103345e370d107; 21538121efe6c8c5b51c742fa02cbe820bc48714 before f9a162c2bbcd0ac85bd07c5b37cf20286048b65c; 21538121efe6c8c5b51c742fa02cbe820bc48714 before 27b7c3e916218b5eb2ee350211140e961bfc49be; 6.18.11 before 6.18.24; 6.19.1 before 6.19.14; +1 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31609
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-31609
Patch
https://git.kernel.org/stable/c/22b7c1c619d808aec4cad3dc42103345e370d107
Patch
https://git.kernel.org/stable/c/27b7c3e916218b5eb2ee350211140e961bfc49be
Patch
https://git.kernel.org/stable/c/a9940dcbe5cb92482c04efc7341039ddf7dbf607
Patch
https://git.kernel.org/stable/c/f9a162c2bbcd0ac85bd07c5b37cf20286048b65c
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