PT-2025-27966 · Linux+5 · Linux Kernel+5

Nicholas Zubrisky

+1

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CVE-2025-38191

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Published

2025-06-13

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Updated

2026-07-18

CVSS v3.1

7.5

High

VectorAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Name of the Vulnerable Software and Affected Versions: Linux kernel (affected versions not specified)
Description: A null pointer dereference error occurs in the Linux kernel when a client sets the PreviousSessionId during the Kerberos session setup stage. This happens because sess->user is not set yet, allowing a null value to be passed to destroy previous session(). The issue is resolved by moving the call to destroy previous session() after ksmbd krb5 authenticate(), where sess->user is set.
Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

NULL Pointer Dereference

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Weakness Enumeration

CWE-476

Related Identifiers

AZL-64701
BDU:2025-09626
CVE-2025-38191
DLA-4328-1
DSA-5973-1
ECHO-54D0-FBCD-F7CF
MGASA-2025-0218
MGASA-2025-0219
USN-7833-1
USN-7833-2
USN-7833-3
USN-7833-4
USN-7834-1
USN-7856-1
USN-8028-1
USN-8028-2
USN-8028-3
USN-8028-4
USN-8028-5
USN-8028-6
USN-8028-7
USN-8028-8
USN-8031-1
USN-8031-2
USN-8031-3
USN-8052-1
USN-8052-2
USN-8074-1
USN-8074-2
USN-8126-1
ZDI-25-610

Affected Products

Astra Linux
Debian
Linuxmint
Linux Kernel
Red Os
Ubuntu