PT-2026-34381 · Linux · Linux Kernel

Published 2026-04-22 · Updated 2026-05-15 · CVE-2026-31476

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw in the ksmbd module occurs when a multichannel session binding request fails, such as due to an incorrect password. In these instances, the error path unconditionally sets the sess->state variable to SMB2 SESSION EXPIRED. Because the sess pointer refers to a target session retrieved via the ksmbd session lookup slowpath() function—which may belong to a user on a different connection—a remote attacker can invalidate any active session by sending a binding request with an incorrect password, resulting in a Denial of Service (DoS).

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-31476

ECHO-983C-9C96-FD0D

OESA-2026-2311

Affected Products

Linux Kernel

References · 49

• https://nvd.nist.gov/vuln/detail/CVE-2026-31699 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31592 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31523 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31441 · Security Note
• https://ubuntu.com/security/CVE-2026-31476 · Vendor Advisory
• https://git.kernel.org/stable/c/1d1888b4a7aec518b707f6eca0bf08992c0e8da3 · Patch
• https://git.kernel.org/stable/c/6fafc4c4238e538969f1375f9ecdc6587c53f1cc · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31476 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31476 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31674 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31667 · Security Note
• https://osv.dev/vulnerability/OESA-2026-2311 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31787 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31773 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-31630 · Security Note