linux-cve-announce - CVE-2022-50372: cifs: Fix memory leak when build ntlmssp negotiate blob failed

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Message-ID: <2025091717-CVE-2022-50372-e3b5@gregkh>
Date: Wed, 17 Sep 2025 16:56:31 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50372: cifs: Fix memory leak when build ntlmssp negotiate blob failed

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

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

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

cifs: Fix memory leak when build ntlmssp negotiate blob failed

There is a memory leak when mount cifs:
  unreferenced object 0xffff888166059600 (size 448):
    comm "mount.cifs", pid 51391, jiffies 4295596373 (age 330.596s)
    hex dump (first 32 bytes):
      fe 53 4d 42 40 00 00 00 00 00 00 00 01 00 82 00  .SMB@...........
      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    backtrace:
      [<0000000060609a61>] mempool_alloc+0xe1/0x260
      [<00000000adfa6c63>] cifs_small_buf_get+0x24/0x60
      [<00000000ebb404c7>] __smb2_plain_req_init+0x32/0x460
      [<00000000bcf875b4>] SMB2_sess_alloc_buffer+0xa4/0x3f0
      [<00000000753a2987>] SMB2_sess_auth_rawntlmssp_negotiate+0xf5/0x480
      [<00000000f0c1f4f9>] SMB2_sess_setup+0x253/0x410
      [<00000000a8b83303>] cifs_setup_session+0x18f/0x4c0
      [<00000000854bd16d>] cifs_get_smb_ses+0xae7/0x13c0
      [<000000006cbc43d9>] mount_get_conns+0x7a/0x730
      [<000000005922d816>] cifs_mount+0x103/0xd10
      [<00000000e33def3b>] cifs_smb3_do_mount+0x1dd/0xc90
      [<0000000078034979>] smb3_get_tree+0x1d5/0x300
      [<000000004371f980>] vfs_get_tree+0x41/0xf0
      [<00000000b670d8a7>] path_mount+0x9b3/0xdd0
      [<000000005e839a7d>] __x64_sys_mount+0x190/0x1d0
      [<000000009404c3b9>] do_syscall_64+0x35/0x80

When build ntlmssp negotiate blob failed, the session setup request
should be freed.

The Linux kernel CVE team has assigned CVE-2022-50372 to this issue.


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

	Issue introduced in 5.16 with commit 49bd49f983b5026e4557d31c5d737d9657c4113e and fixed in 6.0.6 with commit fa5a70bdd5e565c8696fb04dfe18a4e8aff4695d
	Issue introduced in 5.16 with commit 49bd49f983b5026e4557d31c5d737d9657c4113e and fixed in 6.1 with commit 30b2d7f8f13664655480d6af45f60270b3eb6736

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-2022-50372
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/cifs/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/fa5a70bdd5e565c8696fb04dfe18a4e8aff4695d
	https://git.kernel.org/stable/c/30b2d7f8f13664655480d6af45f60270b3eb6736