linux-cve-announce - CVE-2024-56663: wifi: nl80211: fix NL80211_ATTR_MLO_LINK

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Message-ID: <2024122752-CVE-2024-56663-66d7@gregkh>
Date: Fri, 27 Dec 2024 16:07:00 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56663: wifi: nl80211: fix NL80211_ATTR_MLO_LINK_ID off-by-one

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

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

wifi: nl80211: fix NL80211_ATTR_MLO_LINK_ID off-by-one

Since the netlink attribute range validation provides inclusive
checking, the *max* of attribute NL80211_ATTR_MLO_LINK_ID should be
IEEE80211_MLD_MAX_NUM_LINKS - 1 otherwise causing an off-by-one.

One crash stack for demonstration:
==================================================================
BUG: KASAN: wild-memory-access in ieee80211_tx_control_port+0x3b6/0xca0 net/mac80211/tx.c:5939
Read of size 6 at addr 001102080000000c by task fuzzer.386/9508

CPU: 1 PID: 9508 Comm: syz.1.386 Not tainted 6.1.70 #2
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x177/0x231 lib/dump_stack.c:106
 print_report+0xe0/0x750 mm/kasan/report.c:398
 kasan_report+0x139/0x170 mm/kasan/report.c:495
 kasan_check_range+0x287/0x290 mm/kasan/generic.c:189
 memcpy+0x25/0x60 mm/kasan/shadow.c:65
 ieee80211_tx_control_port+0x3b6/0xca0 net/mac80211/tx.c:5939
 rdev_tx_control_port net/wireless/rdev-ops.h:761 [inline]
 nl80211_tx_control_port+0x7b3/0xc40 net/wireless/nl80211.c:15453
 genl_family_rcv_msg_doit+0x22e/0x320 net/netlink/genetlink.c:756
 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline]
 genl_rcv_msg+0x539/0x740 net/netlink/genetlink.c:850
 netlink_rcv_skb+0x1de/0x420 net/netlink/af_netlink.c:2508
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline]
 netlink_unicast+0x74b/0x8c0 net/netlink/af_netlink.c:1352
 netlink_sendmsg+0x882/0xb90 net/netlink/af_netlink.c:1874
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x5cc/0x8f0 net/socket.c:2499
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2553
 __sys_sendmsg net/socket.c:2582 [inline]
 __do_sys_sendmsg net/socket.c:2591 [inline]
 __se_sys_sendmsg+0x19e/0x270 net/socket.c:2589
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x90 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Update the policy to ensure correct validation.

The Linux kernel CVE team has assigned CVE-2024-56663 to this issue.


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

	Issue introduced in 6.0 with commit 7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 and fixed in 6.1.121 with commit 29e640ae641b9f5ffc666049426d2b16c98d9963
	Issue introduced in 6.0 with commit 7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 and fixed in 6.6.67 with commit f3412522f78826fef1dfae40ef378a863df2591c
	Issue introduced in 6.0 with commit 7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 and fixed in 6.12.6 with commit f850d1d9f1106f528dfc5807565f2d1fa9a397d3
	Issue introduced in 6.0 with commit 7b0a0e3c3a88260b6fcb017e49f198463aa62ed1 and fixed in 6.13-rc3 with commit 2e3dbf938656986cce73ac4083500d0bcfbffe24
	Issue introduced in 5.19.2 with commit 7a53ad13c09150076b7ddde96c2dfc5622c90b45

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-2024-56663
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/wireless/nl80211.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/29e640ae641b9f5ffc666049426d2b16c98d9963
	https://git.kernel.org/stable/c/f3412522f78826fef1dfae40ef378a863df2591c
	https://git.kernel.org/stable/c/f850d1d9f1106f528dfc5807565f2d1fa9a397d3
	https://git.kernel.org/stable/c/2e3dbf938656986cce73ac4083500d0bcfbffe24