linux-cve-announce - CVE-2025-37778: ksmbd: Fix dangling pointer in krb

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025050116-CVE-2025-37778-7202@gregkh>
Date: Thu,  1 May 2025 15:07:26 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37778: ksmbd: Fix dangling pointer in krb_authenticate

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: Fix dangling pointer in krb_authenticate

krb_authenticate frees sess->user and does not set the pointer
to NULL. It calls ksmbd_krb5_authenticate to reinitialise
sess->user but that function may return without doing so. If
that happens then smb2_sess_setup, which calls krb_authenticate,
will be accessing free'd memory when it later uses sess->user.

The Linux kernel CVE team has assigned CVE-2025-37778 to this issue.


Affected and fixed versions
===========================

	Fixed in 6.1.135 with commit d5b554bc8d554ed6ddf443d3db2fad9f665cec10
	Fixed in 6.6.88 with commit 1db2451de23e98bc864c6a6e52aa0d82c91cb325
	Fixed in 6.12.25 with commit 6e30c0e10210c714f3d4453dc258d4abcc70364e
	Fixed in 6.14.4 with commit e83e39a5f6a01a81411a4558a59a10f87aa88dd6
	Fixed in 6.15-rc3 with commit 1e440d5b25b7efccb3defe542a73c51005799a5f

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-37778
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/smb/server/smb2pdu.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/d5b554bc8d554ed6ddf443d3db2fad9f665cec10
	https://git.kernel.org/stable/c/1db2451de23e98bc864c6a6e52aa0d82c91cb325
	https://git.kernel.org/stable/c/6e30c0e10210c714f3d4453dc258d4abcc70364e
	https://git.kernel.org/stable/c/e83e39a5f6a01a81411a4558a59a10f87aa88dd6
	https://git.kernel.org/stable/c/1e440d5b25b7efccb3defe542a73c51005799a5f