CVE-2026-45879: power: supply: bq25980: Fix use-after-free in power_supply_changed()

CVE-2026-45879: power: supply: bq25980: Fix use-after-free in power_supply_changed()

[Greg Kroah-Hartman]

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

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

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

power: supply: bq25980: Fix use-after-free in power_supply_changed()

Using the `devm_` variant for requesting IRQ _before_ the `devm_`
variant for allocating/registering the `power_supply` handle, means that
the `power_supply` handle will be deallocated/unregistered _before_ the
interrupt handler (since `devm_` naturally deallocates in reverse
allocation order). This means that during removal, there is a race
condition where an interrupt can fire just _after_ the `power_supply`
handle has been freed, *but* just _before_ the corresponding
unregistration of the IRQ handler has run.

This will lead to the IRQ handler calling `power_supply_changed()` with
a freed `power_supply` handle. Which usually crashes the system or
otherwise silently corrupts the memory...

Note that there is a similar situation which can also happen during
`probe()`; the possibility of an interrupt firing _before_ registering
the `power_supply` handle. This would then lead to the nasty situation
of using the `power_supply` handle *uninitialized* in
`power_supply_changed()`.

Fix this racy use-after-free by making sure the IRQ is requested _after_
the registration of the `power_supply` handle.

The Linux kernel CVE team has assigned CVE-2026-45879 to this issue.


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

	Issue introduced in 5.10 with commit 5069185fc18e810715a91d80fcd075e03add600c and fixed in 5.10.252 with commit 86f93dfb23f5bf4f285c4256a7e909d222f7de56
	Issue introduced in 5.10 with commit 5069185fc18e810715a91d80fcd075e03add600c and fixed in 5.15.202 with commit 16875e3b7bc9e59bfa0acaf1e43f275a6f42a30f
	Issue introduced in 5.10 with commit 5069185fc18e810715a91d80fcd075e03add600c and fixed in 6.1.165 with commit 0560a4b09c92e2ecaa883965cf6f9ca51c158ff9
	Issue introduced in 5.10 with commit 5069185fc18e810715a91d80fcd075e03add600c and fixed in 6.6.128 with commit 0de95d29d847c6217b7d5845e24a71a4aee7b359
	Issue introduced in 5.10 with commit 5069185fc18e810715a91d80fcd075e03add600c and fixed in 6.12.75 with commit 4aeaf03c17260415c2fdd55992f9ad4188d5455a
	Issue introduced in 5.10 with commit 5069185fc18e810715a91d80fcd075e03add600c and fixed in 6.18.14 with commit 03d1e4ee4e6aa6d2966e883e4ca0e5be73bf1b7c
	Issue introduced in 5.10 with commit 5069185fc18e810715a91d80fcd075e03add600c and fixed in 6.19.4 with commit abea607ff2f62f4c0a5fb29f7fbdaaab163276a4
	Issue introduced in 5.10 with commit 5069185fc18e810715a91d80fcd075e03add600c and fixed in 7.0 with commit 5f0b1cb41906e86b64bf69f5ededb83b0d757c27

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-2026-45879
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/power/supply/bq25980_charger.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/86f93dfb23f5bf4f285c4256a7e909d222f7de56
	https://git.kernel.org/stable/c/16875e3b7bc9e59bfa0acaf1e43f275a6f42a30f
	https://git.kernel.org/stable/c/0560a4b09c92e2ecaa883965cf6f9ca51c158ff9
	https://git.kernel.org/stable/c/0de95d29d847c6217b7d5845e24a71a4aee7b359
	https://git.kernel.org/stable/c/4aeaf03c17260415c2fdd55992f9ad4188d5455a
	https://git.kernel.org/stable/c/03d1e4ee4e6aa6d2966e883e4ca0e5be73bf1b7c
	https://git.kernel.org/stable/c/abea607ff2f62f4c0a5fb29f7fbdaaab163276a4
	https://git.kernel.org/stable/c/5f0b1cb41906e86b64bf69f5ededb83b0d757c27