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CVE-2026-52911— ksmbd: scope conn->binding slowpath to bound sessions only

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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ksmbd连接绑定与会话管理问题，可能导致会话查找错误。

CVSS 8.8 · High EPSS 0.66% · P51

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux f5a544e3bab78142207e0242d22442db85ba1eff< e74c00c6af428a39e564cdc5bd3a3648c6d8de87 affected
f5a544e3bab78142207e0242d22442db85ba1eff< e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a affected
f5a544e3bab78142207e0242d22442db85ba1eff< 1ff46c9915c1cbf454db58a8cb87f7cac818e6a6 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 974c1c224e85549dc3459f3bb2255bbbdd2b9372 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 2cc8a4db633b10715450b291c1343859a4b2c509 affected
f5a544e3bab78142207e0242d22442db85ba1eff< 1e2bec062c5c9ec282636715166056d0998d746d affected
f5a544e3bab78142207e0242d22442db85ba1eff< b0da97c034b6107d14e537e212d4ce8b22109a58 affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2026-52911

Vulnerability Information
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Vulnerability Title
ksmbd: scope conn->binding slowpath to bound sessions only
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: scope conn->binding slowpath to bound sessions only When the binding SESSION_SETUP sets conn->binding = true, the flag stays set after the call so that the global session lookup in ksmbd_session_lookup_all() can find the session, which was not added to conn->sessions. Because the flag is connection-wide, the global lookup path will also resolve any other session by id if asked. Tighten the global lookup so that the returned session must have this connection registered in its channel xarray (sess->ksmbd_chann_list). The channel entry is installed by the existing binding_session path in ntlm_authenticate()/krb5_authenticate() when a SESSION_SETUP completes successfully, so this condition is a strict equivalent of "this connection has been accepted as a channel of this session". Connections that have not bound to a given session cannot reach it via the global table. The existing conn->binding gate for entering the slowpath is preserved so that non-binding connections keep the fast-path-only behavior, and the session->state check is unchanged.
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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于ksmbd连接绑定与会话管理问题，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 ~ e74c00c6af428a39e564cdc5bd3a3648c6d8de87 -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-52911

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III. Intelligence Information for CVE-2026-52911

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Patches & Fixes for CVE-2026-52911 (7)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52911

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