linux-cve-announce - CVE-2023-52922: can: bcm: Fix UAF in bcm_proc

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Message-ID: <2024112856-CVE-2023-52922-39e1@gregkh>
Date: Thu, 28 Nov 2024 16:09:57 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52922: can: bcm: Fix UAF in bcm_proc_show()

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

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

can: bcm: Fix UAF in bcm_proc_show()

BUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80
Read of size 8 at addr ffff888155846230 by task cat/7862

CPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xd5/0x150
 print_report+0xc1/0x5e0
 kasan_report+0xba/0xf0
 bcm_proc_show+0x969/0xa80
 seq_read_iter+0x4f6/0x1260
 seq_read+0x165/0x210
 proc_reg_read+0x227/0x300
 vfs_read+0x1d5/0x8d0
 ksys_read+0x11e/0x240
 do_syscall_64+0x35/0xb0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Allocated by task 7846:
 kasan_save_stack+0x1e/0x40
 kasan_set_track+0x21/0x30
 __kasan_kmalloc+0x9e/0xa0
 bcm_sendmsg+0x264b/0x44e0
 sock_sendmsg+0xda/0x180
 ____sys_sendmsg+0x735/0x920
 ___sys_sendmsg+0x11d/0x1b0
 __sys_sendmsg+0xfa/0x1d0
 do_syscall_64+0x35/0xb0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 7846:
 kasan_save_stack+0x1e/0x40
 kasan_set_track+0x21/0x30
 kasan_save_free_info+0x27/0x40
 ____kasan_slab_free+0x161/0x1c0
 slab_free_freelist_hook+0x119/0x220
 __kmem_cache_free+0xb4/0x2e0
 rcu_core+0x809/0x1bd0

bcm_op is freed before procfs entry be removed in bcm_release(),
this lead to bcm_proc_show() may read the freed bcm_op.

The Linux kernel CVE team has assigned CVE-2023-52922 to this issue.


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

	Issue introduced in 2.6.25 with commit ffd980f976e7 and fixed in 4.14.322 with commit 11b8e27ed448
	Issue introduced in 2.6.25 with commit ffd980f976e7 and fixed in 4.19.291 with commit 9b58d36d0c1e
	Issue introduced in 2.6.25 with commit ffd980f976e7 and fixed in 5.4.251 with commit 9533dbfac0ff
	Issue introduced in 2.6.25 with commit ffd980f976e7 and fixed in 5.10.188 with commit cf254b4f68e4
	Issue introduced in 2.6.25 with commit ffd980f976e7 and fixed in 5.15.123 with commit 3c3941bb1eb5
	Issue introduced in 2.6.25 with commit ffd980f976e7 and fixed in 6.1.42 with commit 995f47d76647
	Issue introduced in 2.6.25 with commit ffd980f976e7 and fixed in 6.4.7 with commit dfd0aa26e9a0
	Issue introduced in 2.6.25 with commit ffd980f976e7 and fixed in 6.5 with commit 55c3b96074f3

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-2023-52922
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/can/bcm.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/11b8e27ed448baa385d90154a141466bd5e92f18
	https://git.kernel.org/stable/c/9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff
	https://git.kernel.org/stable/c/9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6
	https://git.kernel.org/stable/c/cf254b4f68e480e73dab055014e002b77aed30ed
	https://git.kernel.org/stable/c/3c3941bb1eb53abe7d640ffee5c4d6b559829ab3
	https://git.kernel.org/stable/c/995f47d76647708ec26c6e388663ad4f3f264787
	https://git.kernel.org/stable/c/dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7
	https://git.kernel.org/stable/c/55c3b96074f3f9b0aee19bf93cd71af7516582bb