linux-cve-announce - CVE-2024-50268: usb: typec: fix potential out of bounds in ucsi_ccg_update_set_new_cam

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Message-ID: <2024111925-CVE-2024-50268-9b55@gregkh>
Date: Tue, 19 Nov 2024 02:32:23 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50268: usb: typec: fix potential out of bounds in ucsi_ccg_update_set_new_cam_cmd()

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

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

usb: typec: fix potential out of bounds in ucsi_ccg_update_set_new_cam_cmd()

The "*cmd" variable can be controlled by the user via debugfs.  That means
"new_cam" can be as high as 255 while the size of the uc->updated[] array
is UCSI_MAX_ALTMODES (30).

The call tree is:
ucsi_cmd() // val comes from simple_attr_write_xsigned()
-> ucsi_send_command()
   -> ucsi_send_command_common()
      -> ucsi_run_command() // calls ucsi->ops->sync_control()
         -> ucsi_ccg_sync_control()

The Linux kernel CVE team has assigned CVE-2024-50268 to this issue.


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

	Issue introduced in 5.6 with commit 170a6726d0e2 and fixed in 5.10.230 with commit d76923164705
	Issue introduced in 5.6 with commit 170a6726d0e2 and fixed in 5.15.172 with commit 8f47984b35f3
	Issue introduced in 5.6 with commit 170a6726d0e2 and fixed in 6.1.117 with commit 604314ecd682
	Issue introduced in 5.6 with commit 170a6726d0e2 and fixed in 6.6.61 with commit 69e19774f15e
	Issue introduced in 5.6 with commit 170a6726d0e2 and fixed in 6.11.8 with commit 3a2ba841659a
	Issue introduced in 5.6 with commit 170a6726d0e2 and fixed in 6.12 with commit 7dd08a0b4193

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-2024-50268
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:
	drivers/usb/typec/ucsi/ucsi_ccg.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/d76923164705821aa1b01b8d9d1741f20c654ab4
	https://git.kernel.org/stable/c/8f47984b35f3be0cfc652c2ca358d5768ea3456b
	https://git.kernel.org/stable/c/604314ecd682913925980dc955caea2d036eab5f
	https://git.kernel.org/stable/c/69e19774f15e12dda6c6c58001d059e30895009b
	https://git.kernel.org/stable/c/3a2ba841659a0f15102585120dea75d8d5209616
	https://git.kernel.org/stable/c/7dd08a0b4193087976db6b3ee7807de7e8316f96