CVE-2026-72076: Input: ims-pcu - fix out-of-bounds read in ims_pcu_irq() debug logging

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

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

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

Input: ims-pcu - fix out-of-bounds read in ims_pcu_irq() debug logging

The debug logging in ims_pcu_irq() unconditionally prints data from
pcu->urb_in_buf. However, if the interrupt fired for pcu->urb_ctrl, the
actual data resides in pcu->urb_ctrl_buf. If urb->actual_length for the
control URB exceeds pcu->max_in_size, this leads to an out-of-bounds
read.

Fix this by printing from the correct buffer associated with the URB.

The Linux kernel CVE team has assigned CVE-2026-72076 to this issue.


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

	Issue introduced in 3.10 with commit 628329d52474323938a03826941e166bc7c8eff4 and fixed in 5.10.261 with commit 4d2553e9a76a11500ec670cbe16b7fd3da4832de
	Issue introduced in 3.10 with commit 628329d52474323938a03826941e166bc7c8eff4 and fixed in 5.15.212 with commit b746e853721dee91e4234c033d1b90f4605705bb
	Issue introduced in 3.10 with commit 628329d52474323938a03826941e166bc7c8eff4 and fixed in 6.1.178 with commit e6153407d7edabc6ff98f0fda415d556c0bcb57a
	Issue introduced in 3.10 with commit 628329d52474323938a03826941e166bc7c8eff4 and fixed in 6.6.145 with commit 3fd7c0ace245334f2a0bd29fdcb680ad56e9b275
	Issue introduced in 3.10 with commit 628329d52474323938a03826941e166bc7c8eff4 and fixed in 6.12.97 with commit 20fbf3ca0259d00664d1ede88837e1f11b49a88e
	Issue introduced in 3.10 with commit 628329d52474323938a03826941e166bc7c8eff4 and fixed in 6.18.40 with commit 9c964fc9507aeab74376ba9f892cf84ad6950dfe
	Issue introduced in 3.10 with commit 628329d52474323938a03826941e166bc7c8eff4 and fixed in 7.1.5 with commit f97bfc1a0766802a99167b3dc62d1ee7dca929fe
	Issue introduced in 3.10 with commit 628329d52474323938a03826941e166bc7c8eff4 and fixed in 7.2-rc1 with commit 403b0a6970b1084bb27907c0f8225801fdd0fe1d

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-2026-72076
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/input/misc/ims-pcu.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/4d2553e9a76a11500ec670cbe16b7fd3da4832de
	https://git.kernel.org/stable/c/b746e853721dee91e4234c033d1b90f4605705bb
	https://git.kernel.org/stable/c/e6153407d7edabc6ff98f0fda415d556c0bcb57a
	https://git.kernel.org/stable/c/3fd7c0ace245334f2a0bd29fdcb680ad56e9b275
	https://git.kernel.org/stable/c/20fbf3ca0259d00664d1ede88837e1f11b49a88e
	https://git.kernel.org/stable/c/9c964fc9507aeab74376ba9f892cf84ad6950dfe
	https://git.kernel.org/stable/c/f97bfc1a0766802a99167b3dc62d1ee7dca929fe
	https://git.kernel.org/stable/c/403b0a6970b1084bb27907c0f8225801fdd0fe1d