linux-cve-announce - CVE-2025-37954: smb: client: Avoid race in open_cached

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Message-ID: <2025052002-CVE-2025-37954-6751@gregkh>
Date: Tue, 20 May 2025 18:02:08 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37954: smb: client: Avoid race in open_cached_dir with lease breaks

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

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

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

smb: client: Avoid race in open_cached_dir with lease breaks

A pre-existing valid cfid returned from find_or_create_cached_dir might
race with a lease break, meaning open_cached_dir doesn't consider it
valid, and thinks it's newly-constructed. This leaks a dentry reference
if the allocation occurs before the queued lease break work runs.

Avoid the race by extending holding the cfid_list_lock across
find_or_create_cached_dir and when the result is checked.

The Linux kernel CVE team has assigned CVE-2025-37954 to this issue.


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

	Fixed in 6.6.91 with commit 2ed98e89ebc2e1bc73534dc3c18cb7843a889ff9
	Fixed in 6.12.29 with commit 571dcf3d27b24800c171aea7b5e04ff06d10e2e9
	Fixed in 6.14.7 with commit 2407265dc32bc8cc45b62a612c2a214ba9038e8b
	Fixed in 6.15-rc6 with commit 3ca02e63edccb78ef3659bebc68579c7224a6ca2

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-2025-37954
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/client/cached_dir.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/2ed98e89ebc2e1bc73534dc3c18cb7843a889ff9
	https://git.kernel.org/stable/c/571dcf3d27b24800c171aea7b5e04ff06d10e2e9
	https://git.kernel.org/stable/c/2407265dc32bc8cc45b62a612c2a214ba9038e8b
	https://git.kernel.org/stable/c/3ca02e63edccb78ef3659bebc68579c7224a6ca2