linux-cve-announce - CVE-2025-22029: exec: fix the racy usage of fs_struct->in

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Message-ID: <2025041655-CVE-2025-22029-349f@gregkh>
Date: Wed, 16 Apr 2025 16:12:00 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22029: exec: fix the racy usage of fs_struct->in_exec

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

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

exec: fix the racy usage of fs_struct->in_exec

check_unsafe_exec() sets fs->in_exec under cred_guard_mutex, then execve()
paths clear fs->in_exec lockless. This is fine if exec succeeds, but if it
fails we have the following race:

	T1 sets fs->in_exec = 1, fails, drops cred_guard_mutex

	T2 sets fs->in_exec = 1

	T1 clears fs->in_exec

	T2 continues with fs->in_exec == 0

Change fs/exec.c to clear fs->in_exec with cred_guard_mutex held.

The Linux kernel CVE team has assigned CVE-2025-22029 to this issue.


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

	Fixed in 6.6.87 with commit 753a620a7f8e134b444f89fe90873234e894e21a
	Fixed in 6.12.23 with commit e2d8e7bd3314485e0b3b08380c659b3d1d67ed6a
	Fixed in 6.13.11 with commit a6b5070721503fb6021ebed51c925ffc66b1c5ab
	Fixed in 6.14.2 with commit b519f2e5800fe2391b7545ba6889df795828e885
	Fixed in 6.15-rc1 with commit af7bb0d2ca459f15cb5ca604dab5d9af103643f0

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-2025-22029
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/exec.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/753a620a7f8e134b444f89fe90873234e894e21a
	https://git.kernel.org/stable/c/e2d8e7bd3314485e0b3b08380c659b3d1d67ed6a
	https://git.kernel.org/stable/c/a6b5070721503fb6021ebed51c925ffc66b1c5ab
	https://git.kernel.org/stable/c/b519f2e5800fe2391b7545ba6889df795828e885
	https://git.kernel.org/stable/c/af7bb0d2ca459f15cb5ca604dab5d9af103643f0