CVE-2026-43345: net: ipa: fix event ring index not programmed for IPA v5.0+

CVE-2026-43345: net: ipa: fix event ring index not programmed for IPA v5.0+

[Greg Kroah-Hartman]

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

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

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

net: ipa: fix event ring index not programmed for IPA v5.0+

For IPA v5.0+, the event ring index field moved from CH_C_CNTXT_0 to
CH_C_CNTXT_1. The v5.0 register definition intended to define this
field in the CH_C_CNTXT_1 fmask array but used the old identifier of
ERINDEX instead of CH_ERINDEX.

Without a valid event ring, GSI channels could never signal transfer
completions. This caused gsi_channel_trans_quiesce() to block
forever in wait_for_completion().

At least for IPA v5.2 this resolves an issue seen where runtime
suspend, system suspend, and remoteproc stop all hanged forever. It
also meant the IPA data path was completely non functional.

The Linux kernel CVE team has assigned CVE-2026-43345 to this issue.


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

	Issue introduced in 6.4 with commit faf0678ec8a0aa9039d8b188d012206abd67dd5c and fixed in 6.6.136 with commit ae8343a19ccb051d519dbb3a9082ddea9f0551d3
	Issue introduced in 6.4 with commit faf0678ec8a0aa9039d8b188d012206abd67dd5c and fixed in 6.12.83 with commit 2bf18b643c4656413f7cfd5615af60a6b4e261da
	Issue introduced in 6.4 with commit faf0678ec8a0aa9039d8b188d012206abd67dd5c and fixed in 6.18.24 with commit 2d2dc166d55148cfcf8ae67b415f8d6d110e6fca
	Issue introduced in 6.4 with commit faf0678ec8a0aa9039d8b188d012206abd67dd5c and fixed in 6.19.14 with commit 34c988bb04cbdf093d2134e179433da49ffcd044
	Issue introduced in 6.4 with commit faf0678ec8a0aa9039d8b188d012206abd67dd5c and fixed in 7.0 with commit 56007972c0b1e783ca714d6f1f4d6e66e531d21f

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-2026-43345
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/net/ipa/reg/gsi_reg-v5.0.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/ae8343a19ccb051d519dbb3a9082ddea9f0551d3
	https://git.kernel.org/stable/c/2bf18b643c4656413f7cfd5615af60a6b4e261da
	https://git.kernel.org/stable/c/2d2dc166d55148cfcf8ae67b415f8d6d110e6fca
	https://git.kernel.org/stable/c/34c988bb04cbdf093d2134e179433da49ffcd044
	https://git.kernel.org/stable/c/56007972c0b1e783ca714d6f1f4d6e66e531d21f