CVE-2026-72067: cpu: hotplug: Preserve per instance callback errors

From: Greg Kroah-Hartman <[email protected]>

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

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

cpu: hotplug: Preserve per instance callback errors

cpuhp_invoke_callback() unwinds earlier callbacks for the same
hotplug state when one instance fails. The rollback path currently
reuses ret, so a successful rollback can hide the original error and
make the failed transition look successful.

Keep the rollback result separate from the original error.

The Linux kernel CVE team has assigned CVE-2026-72067 to this issue.


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

	Issue introduced in 4.14 with commit 724a86881d03ee5794148e65142e24ed3621be66 and fixed in 5.10.261 with commit fe9c8d641f6991614d1229a3ffd3e33b879bba9c
	Issue introduced in 4.14 with commit 724a86881d03ee5794148e65142e24ed3621be66 and fixed in 5.15.212 with commit ef39758637cc5b603fb05b625c45a98aa306e338
	Issue introduced in 4.14 with commit 724a86881d03ee5794148e65142e24ed3621be66 and fixed in 6.1.178 with commit 95232281512b15338549171ed9a2acf21f946ffb
	Issue introduced in 4.14 with commit 724a86881d03ee5794148e65142e24ed3621be66 and fixed in 6.6.145 with commit 7a68257b90d8a9b6d605abc99469ded45ecba63b
	Issue introduced in 4.14 with commit 724a86881d03ee5794148e65142e24ed3621be66 and fixed in 6.12.97 with commit 77d4fa8a3ea1c3e8b996ac35e59aee9e77389905
	Issue introduced in 4.14 with commit 724a86881d03ee5794148e65142e24ed3621be66 and fixed in 6.18.40 with commit f77117530fc3f5932ffb107182a6dd34006be9b6
	Issue introduced in 4.14 with commit 724a86881d03ee5794148e65142e24ed3621be66 and fixed in 7.1.5 with commit 9f7dc355f62c011e4afe8286cf71130d4bfb9d80
	Issue introduced in 4.14 with commit 724a86881d03ee5794148e65142e24ed3621be66 and fixed in 7.2-rc1 with commit 673db10729fb121ea1b16fe57791a0cb9eac1eb5

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-2026-72067
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:
	kernel/cpu.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/fe9c8d641f6991614d1229a3ffd3e33b879bba9c
	https://git.kernel.org/stable/c/ef39758637cc5b603fb05b625c45a98aa306e338
	https://git.kernel.org/stable/c/95232281512b15338549171ed9a2acf21f946ffb
	https://git.kernel.org/stable/c/7a68257b90d8a9b6d605abc99469ded45ecba63b
	https://git.kernel.org/stable/c/77d4fa8a3ea1c3e8b996ac35e59aee9e77389905
	https://git.kernel.org/stable/c/f77117530fc3f5932ffb107182a6dd34006be9b6
	https://git.kernel.org/stable/c/9f7dc355f62c011e4afe8286cf71130d4bfb9d80
	https://git.kernel.org/stable/c/673db10729fb121ea1b16fe57791a0cb9eac1eb5