High severity · published Apr 6, 2026
CVE-2026-31409
ksmbd: unset conn->binding on failed binding request
8.8
CVSS
0.5%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: unset conn->binding on failed binding request
When a multichannel SMB2_SESSION_SETUP request with
SMB2_SESSION_REQ_FLAG_BINDING fails ksmbd sets conn->binding = true
but never clears it on the error path. This leaves the connection in
a binding state where all subsequent ksmbd_session_lookup_all() calls
fall back to the global sessions table. This fix it by clearing
conn->binding = false in the error path.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
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
5.15 before 6.1.167; 6.2 before 6.6.130; 6.7 before 6.12.78; 6.13 before 6.18.20; 6.19 before 6.19.10; 7.0; +3 more · source: NVD
LI
Linux · Linux
f5a544e3bab78142207e0242d22442db85ba1eff before 7e8b270813079c785696bce8802a3f920665c88c; f5a544e3bab78142207e0242d22442db85ba1eff before d073870dab8f6dadced81d13d273ff0b21cb7f4e; f5a544e3bab78142207e0242d22442db85ba1eff before 6ebef4a220a1ebe345de899ebb9ae394206fe921; f5a544e3bab78142207e0242d22442db85ba1eff before 89afe5e2dbea6e9d8e5f11324149d06fa3a4efca; f5a544e3bab78142207e0242d22442db85ba1eff before 9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772; f5a544e3bab78142207e0242d22442db85ba1eff before 6260fc85ed1298a71d24a75d01f8b2e56d489a60; +2 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-31409
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-31409
Patch
https://git.kernel.org/stable/c/282343cf8a4a5a3603b1cb0e17a7083e4a593b03
Patch
https://git.kernel.org/stable/c/6260fc85ed1298a71d24a75d01f8b2e56d489a60
Patch
https://git.kernel.org/stable/c/6ebef4a220a1ebe345de899ebb9ae394206fe921
git.kernel.org
https://git.kernel.org/stable/c/7e8b270813079c785696bce8802a3f920665c88c
Patch
https://git.kernel.org/stable/c/89afe5e2dbea6e9d8e5f11324149d06fa3a4efca
Patch
https://git.kernel.org/stable/c/9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772
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