CVE-2026-31476

HIGH EPSS 39.0%

Published Apr 22, 20262mo ago · Modified Jun 17, 20261w ago

8.2 CVSS 3.1

High

Published Apr 22, 2026 2mo ago

Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: do not expire session on binding failure When a multichannel session binding request fails (e.g. wrong password), the error path unconditionally sets sess->state = SMB2_SESSION_EXPIRED. However, during binding, sess points to the target session looked up via ksmbd_session_lookup_slowpath() -- which belongs to another connection's user. This allows a remote attacker to invalidate any active session by simply sending a binding request with a wrong password (DoS). Fix this by skipping session expiration when the failed request was a binding attempt, since the session does not belong to the current connection. The reference taken by ksmbd_session_lookup_slowpath() is still correctly released via ksmbd_user_session_put().

CVSS Details

Base Score

8.2

Exploitability

3.9

Impact

4.2

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality None

Integrity Low

Availability High

Threat Intelligence

EPSS Exploit Probability

39.0% percentile

Exploit & Patch Status

No Known Exploit

Patch Available

Affected Products 13

Vendor	Product	Version	Range
linux	linux_kernel	*	≥5.15.1 – <6.1.168
linux	linux_kernel	*	≥6.2 – <6.6.131
linux	linux_kernel	*	≥6.7 – <6.12.80
linux	linux_kernel	*	≥6.13 – <6.18.21
linux	linux_kernel	*	≥6.19 – <6.19.11
linux	linux_kernel	5.15	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any
linux	linux_kernel	7.0	any

References 7

git.kernel.org https://git.kernel.org/stable/c/1d1888b4a7aec518b707f6eca0bf08992c0e8da3

Patch
git.kernel.org https://git.kernel.org/stable/c/4642ea35c03cf3d3558c009df4757cdb7af3f82d
git.kernel.org https://git.kernel.org/stable/c/6fafc4c4238e538969f1375f9ecdc6587c53f1cc

Patch
git.kernel.org https://git.kernel.org/stable/c/9bbb19d21ded7d78645506f20d8c44895e3d0fb9

Patch
git.kernel.org https://git.kernel.org/stable/c/a897064a457056acb976e20e3007cdf553de340f

Patch
git.kernel.org https://git.kernel.org/stable/c/e0e5edc81b241c70355217de7e120c97c3429deb

Patch
git.kernel.org https://git.kernel.org/stable/c/f5300690c23c5ac860499bb37dbc09cf43fd62e6

Patch

Remediation

git.kernel.org https://git.kernel.org/stable/c/1d1888b4a7aec518b707f6eca0bf08992c0e8da3

Patch
git.kernel.org https://git.kernel.org/stable/c/6fafc4c4238e538969f1375f9ecdc6587c53f1cc

Patch
git.kernel.org https://git.kernel.org/stable/c/9bbb19d21ded7d78645506f20d8c44895e3d0fb9

Patch
git.kernel.org https://git.kernel.org/stable/c/a897064a457056acb976e20e3007cdf553de340f

Patch
git.kernel.org https://git.kernel.org/stable/c/e0e5edc81b241c70355217de7e120c97c3429deb

Patch
git.kernel.org https://git.kernel.org/stable/c/f5300690c23c5ac860499bb37dbc09cf43fd62e6

Patch