CVE-2026-98697: USB: serial: fix dynamic id driver deregistration race

CVE-2026-98697: USB: serial: fix dynamic id driver deregistration race

[Greg Kroah-Hartman]

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

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

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

USB: serial: fix dynamic id driver deregistration race

Only free the dynamic ids after having deregistered the driver and
removed the "new_id" attribute to avoid leaking any id added by a racing
write to the attribute.

The Linux kernel CVE team has assigned CVE-2026-98697 to this issue.


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

	Issue introduced in 2.6.21 with commit 93bacefc4cc0b53e1cb6a336d43847154fdf6886 and fixed in 6.12.113 with commit ebd8fcaaacb66c15ae7e19d14619abe3762e0701
	Issue introduced in 2.6.21 with commit 93bacefc4cc0b53e1cb6a336d43847154fdf6886 and fixed in 6.18.56 with commit 4d6da6867b4ac6468d634a0dd3c35dfc0dc8af81
	Issue introduced in 2.6.21 with commit 93bacefc4cc0b53e1cb6a336d43847154fdf6886 and fixed in 7.2.10 with commit 380f57cd58e26e0f3687451196ec446c473c52d9
	Issue introduced in 2.6.21 with commit 93bacefc4cc0b53e1cb6a336d43847154fdf6886 and fixed in 7.3-rc6 with commit 63594e8ffe097bc0b7639936f33799a7653dded2

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-2026-98697
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/serial/bus.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/ebd8fcaaacb66c15ae7e19d14619abe3762e0701
	https://git.kernel.org/stable/c/4d6da6867b4ac6468d634a0dd3c35dfc0dc8af81
	https://git.kernel.org/stable/c/380f57cd58e26e0f3687451196ec446c473c52d9
	https://git.kernel.org/stable/c/63594e8ffe097bc0b7639936f33799a7653dded2