CVE-2026-93262: md/raid5-ppl: fix use-after-free in ppl_do_flush()

CVE-2026-93262: md/raid5-ppl: fix use-after-free in ppl_do_flush()

[Greg Kroah-Hartman]

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

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

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

md/raid5-ppl: fix use-after-free in ppl_do_flush()

The loop in ppl_do_flush() continues iterating after calling
ppl_io_unit_finished(), touching io->pending_flushes and leading to a
use-after-free.

Add a break statement to stop the loop once io is freed.

The Linux kernel CVE team has assigned CVE-2026-93262 to this issue.


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

	Issue introduced in 4.16 with commit 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 and fixed in 5.10.270 with commit cf01f9413565e86673baf927291a088b6975692b
	Issue introduced in 4.16 with commit 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 and fixed in 5.15.221 with commit e7505842f1329ece90cb9ea0db87772aeca44052
	Issue introduced in 4.16 with commit 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 and fixed in 6.1.188 with commit b5123bf667ac29ddd8106f9ca7cc01316513ae66
	Issue introduced in 4.16 with commit 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 and fixed in 6.6.157 with commit e77c80670f2c2bf491da9b173931e1da4677c23a
	Issue introduced in 4.16 with commit 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 and fixed in 6.12.110 with commit 8914c3d40870f16429a326e97e4016bedc6ede4c
	Issue introduced in 4.16 with commit 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 and fixed in 6.18.52 with commit 455b56209f9615c3902dcc398dd867abb5ade3ab
	Issue introduced in 4.16 with commit 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 and fixed in 7.2.6 with commit fcf21df7d3c50c8ebeb0757df5d21b02dcae4218
	Issue introduced in 4.16 with commit 1532d9e87e8b2377f12929f9e40724d5fbe6ecc5 and fixed in 7.3-rc1 with commit 371f7a1b392edc8b7cf449cc7713179b588f2d0e

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-2026-93262
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/md/raid5-ppl.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/cf01f9413565e86673baf927291a088b6975692b
	https://git.kernel.org/stable/c/e7505842f1329ece90cb9ea0db87772aeca44052
	https://git.kernel.org/stable/c/b5123bf667ac29ddd8106f9ca7cc01316513ae66
	https://git.kernel.org/stable/c/e77c80670f2c2bf491da9b173931e1da4677c23a
	https://git.kernel.org/stable/c/8914c3d40870f16429a326e97e4016bedc6ede4c
	https://git.kernel.org/stable/c/455b56209f9615c3902dcc398dd867abb5ade3ab
	https://git.kernel.org/stable/c/fcf21df7d3c50c8ebeb0757df5d21b02dcae4218
	https://git.kernel.org/stable/c/371f7a1b392edc8b7cf449cc7713179b588f2d0e