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

CVSS 8.8 · High EPSS 0.03% · P10
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux f5a544e3bab78142207e0242d22442db85ba1eff ~ d073870dab8f6dadced81d13d273ff0b21cb7f4e -
LinuxLinux 5.15 -

II. Public POCs for CVE-2026-31409

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III. Intelligence Information for CVE-2026-31409

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

CVE-2026-314059.8 CRITICALmedia: dvb-net: fix OOB access in ULE extension header tables
CVE-2026-314088.8 HIGHBluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
CVE-2026-314067.8 HIGHxfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
CVE-2026-314077.1 HIGHnetfilter: conntrack: add missing netlink policy validations
CVE-2026-31410ksmbd: 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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