linux-cve-announce - CVE-2024-57899: wifi: mac80211: fix mbss changed flags corruption on 32 bit systems

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Message-ID: <2025011515-CVE-2024-57899-0b1c@gregkh>
Date: Wed, 15 Jan 2025 14:06:22 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-57899: wifi: mac80211: fix mbss changed flags corruption on 32 bit systems

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

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

wifi: mac80211: fix mbss changed flags corruption on 32 bit systems

On 32-bit systems, the size of an unsigned long is 4 bytes,
while a u64 is 8 bytes. Therefore, when using
or_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE),
the code is incorrectly searching for a bit in a 32-bit
variable that is expected to be 64 bits in size,
leading to incorrect bit finding.

Solution: Ensure that the size of the bits variable is correctly
adjusted for each architecture.

 Call Trace:
  ? show_regs+0x54/0x58
  ? __warn+0x6b/0xd4
  ? ieee80211_link_info_change_notify+0xcc/0xd4 [mac80211]
  ? report_bug+0x113/0x150
  ? exc_overflow+0x30/0x30
  ? handle_bug+0x27/0x44
  ? exc_invalid_op+0x18/0x50
  ? handle_exception+0xf6/0xf6
  ? exc_overflow+0x30/0x30
  ? ieee80211_link_info_change_notify+0xcc/0xd4 [mac80211]
  ? exc_overflow+0x30/0x30
  ? ieee80211_link_info_change_notify+0xcc/0xd4 [mac80211]
  ? ieee80211_mesh_work+0xff/0x260 [mac80211]
  ? cfg80211_wiphy_work+0x72/0x98 [cfg80211]
  ? process_one_work+0xf1/0x1fc
  ? worker_thread+0x2c0/0x3b4
  ? kthread+0xc7/0xf0
  ? mod_delayed_work_on+0x4c/0x4c
  ? kthread_complete_and_exit+0x14/0x14
  ? ret_from_fork+0x24/0x38
  ? kthread_complete_and_exit+0x14/0x14
  ? ret_from_fork_asm+0xf/0x14
  ? entry_INT80_32+0xf0/0xf0

[restore no-op path for no changes]

The Linux kernel CVE team has assigned CVE-2024-57899 to this issue.


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

	Fixed in 6.6.70 with commit 86772872f9f5097cd03d0e1c6813238bd38c250b
	Fixed in 6.12.9 with commit 36b739637d7042843f9df57212ecee6ed6e0d4b2
	Fixed in 6.13-rc3 with commit 49dba1ded8dd5a6a12748631403240b2ab245c34

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-2024-57899
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:
	net/mac80211/mesh.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/86772872f9f5097cd03d0e1c6813238bd38c250b
	https://git.kernel.org/stable/c/36b739637d7042843f9df57212ecee6ed6e0d4b2
	https://git.kernel.org/stable/c/49dba1ded8dd5a6a12748631403240b2ab245c34