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CVE-2026-31409— ksmbd: unset conn->binding on failed binding request

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于绑定请求失败后未清除绑定状态，可能导致会话查找错误。

CVSS 8.8 · High EPSS 0.66% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux f5a544e3bab78142207e0242d22442db85ba1eff< 7e8b270813079c785696bce8802a3f920665c88c affected
f5a544e3bab78142207e0242d22442db85ba1eff< d073870dab8f6dadced81d13d273ff0b21cb7f4e affected
f5a544e3bab78142207e0242d22442db85ba1eff< 6ebef4a220a1ebe345de899ebb9ae394206fe921 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 89afe5e2dbea6e9d8e5f11324149d06fa3a4efca affected
f5a544e3bab78142207e0242d22442db85ba1eff< 9feb2d1bf86d9e5e66b8565f37f8d3a7d281a772 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 6260fc85ed1298a71d24a75d01f8b2e56d489a60 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 282343cf8a4a5a3603b1cb0e17a7083e4a593b03 affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2026-31409

Vulnerability Information
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Vulnerability Title
ksmbd: unset conn->binding on failed binding request
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于绑定请求失败后未清除绑定状态，可能导致会话查找错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f5a544e3bab78142207e0242d22442db85ba1eff ~ 7e8b270813079c785696bce8802a3f920665c88c -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-31409

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III. Intelligence Information for CVE-2026-31409

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Patches & Fixes for CVE-2026-31409 (1)

Same Patch Batch · Linux · 2026-04-06 · 6 CVEs total

CVE-2026-31405 9.8 CRITICAL media: dvb-net: fix OOB access in ULE extension header tables
CVE-2026-31408 8.8 HIGH Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
CVE-2026-31406 7.8 HIGH xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
CVE-2026-31407 7.1 HIGH netfilter: conntrack: add missing netlink policy validations
CVE-2026-31410 ksmbd: use volume UUID in FS_OBJECT_ID_INFORMATION

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31409

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