From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: CVE-2022-49686: usb: gadget: uvc: fix list double add in uvcg_video_pump
Date: Wed, 26 Feb 2025 03:24:09 +0100 [thread overview]
Message-ID: <2025022626-CVE-2022-49686-29d5@gregkh> (raw)
Description
===========
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: uvc: fix list double add in uvcg_video_pump
A panic can occur if the endpoint becomes disabled and the
uvcg_video_pump adds the request back to the req_free list after it has
already been queued to the endpoint. The endpoint complete will add the
request back to the req_free list. Invalidate the local request handle
once it's been queued.
<6>[ 246.796704][T13726] configfs-gadget gadget: uvc: uvc_function_set_alt(1, 0)
<3>[ 246.797078][ T26] list_add double add: new=ffffff878bee5c40, prev=ffffff878bee5c40, next=ffffff878b0f0a90.
<6>[ 246.797213][ T26] ------------[ cut here ]------------
<2>[ 246.797224][ T26] kernel BUG at lib/list_debug.c:31!
<6>[ 246.807073][ T26] Call trace:
<6>[ 246.807180][ T26] uvcg_video_pump+0x364/0x38c
<6>[ 246.807366][ T26] process_one_work+0x2a4/0x544
<6>[ 246.807394][ T26] worker_thread+0x350/0x784
<6>[ 246.807442][ T26] kthread+0x2ac/0x320
The Linux kernel CVE team has assigned CVE-2022-49686 to this issue.
Affected and fixed versions
===========================
Issue introduced in 5.16 with commit f9897ec0f6d34e8b2bc2f4c8ab8789351090f3d2 and fixed in 5.18.8 with commit d95ac8b920de1d39525fadc408ce675697626ca6
Issue introduced in 5.16 with commit f9897ec0f6d34e8b2bc2f4c8ab8789351090f3d2 and fixed in 5.19 with commit 96163f835e65f8c9897487fac965819f0651d671
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-2022-49686
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/gadget/function/uvc_video.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/d95ac8b920de1d39525fadc408ce675697626ca6
https://git.kernel.org/stable/c/96163f835e65f8c9897487fac965819f0651d671
reply other threads:[~2025-02-26 2:27 UTC|newest]
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