CVE-2026-93071: media: bcm2835-unicam: Fix asc leaked in error/remove path

CVE-2026-93071: media: bcm2835-unicam: Fix asc leaked in error/remove path

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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

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

media: bcm2835-unicam: Fix asc leaked in error/remove path

v4l2_async_nf_add_fwnode_remote() allocates the asc, which is freed when
v4l2_async_nf_cleanup() is called.

Call v4l2_async_nf_cleanup() properly in the driver paths.

Discovered with kmemleak after rmmod:

unreferenced object 0xffff000084526b80 (size 64):
  comm "modprobe", pid 185, jiffies 4295013512
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 e8 0d ff bf 00 00 ff ff  ................
    40 83 bc 84 00 00 ff ff 60 83 bc 84 00 00 ff ff  @.......`.......
  backtrace (crc ac584083):
    [<00000000ffb081a7>] kmemleak_alloc+0x38/0x44
    [<00000000d2fd9301>] __kmalloc+0x1b0/0x250
    [<000000004dd5354d>] __v4l2_async_nf_add_fwnode+0x28/0x9c
    [<0000000067587657>] __v4l2_async_nf_add_fwnode_remote+0x3c/0x64

The Linux kernel CVE team has assigned CVE-2026-93071 to this issue.


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

	Issue introduced in 6.10 with commit 392cd78d495f36c201eb5cc425b01017d493e094 and fixed in 6.12.110 with commit 5479372db364c80bb6bd59f640f5c31de3984bab
	Issue introduced in 6.10 with commit 392cd78d495f36c201eb5cc425b01017d493e094 and fixed in 6.18.52 with commit 2c29cd408ef86e695acb2a5d4e00fa2f5695368d
	Issue introduced in 6.10 with commit 392cd78d495f36c201eb5cc425b01017d493e094 and fixed in 7.2.6 with commit de9be39cefda1ecd762e6a913665c01f7bb18100
	Issue introduced in 6.10 with commit 392cd78d495f36c201eb5cc425b01017d493e094 and fixed in 7.3-rc1 with commit 253c9659e25131b0169f718e7d094ac1aa0d9279

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-2026-93071
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/media/platform/broadcom/bcm2835-unicam.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/5479372db364c80bb6bd59f640f5c31de3984bab
	https://git.kernel.org/stable/c/2c29cd408ef86e695acb2a5d4e00fa2f5695368d
	https://git.kernel.org/stable/c/de9be39cefda1ecd762e6a913665c01f7bb18100
	https://git.kernel.org/stable/c/253c9659e25131b0169f718e7d094ac1aa0d9279