CVE-2026-43352: i3c: mipi-i3c-hci: Correct RING_CTRL_ABORT handling in DMA dequeue

CVE-2026-43352: i3c: mipi-i3c-hci: Correct RING_CTRL_ABORT handling in DMA dequeue

[Greg Kroah-Hartman]

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

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

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

i3c: mipi-i3c-hci: Correct RING_CTRL_ABORT handling in DMA dequeue

The logic used to abort the DMA ring contains several flaws:

 1. The driver unconditionally issues a ring abort even when the ring has
    already stopped.
 2. The completion used to wait for abort completion is never
    re-initialized, resulting in incorrect wait behavior.
 3. The abort sequence unintentionally clears RING_CTRL_ENABLE, which
    resets hardware ring pointers and disrupts the controller state.
 4. If the ring is already stopped, the abort operation should be
    considered successful without attempting further action.

Fix the abort handling by checking whether the ring is running before
issuing an abort, re-initializing the completion when needed, ensuring that
RING_CTRL_ENABLE remains asserted during abort, and treating an already
stopped ring as a successful condition.

The Linux kernel CVE team has assigned CVE-2026-43352 to this issue.


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

	Issue introduced in 5.11 with commit 9ad9a52cce2828d932ae9495181e3d6414f72c07 and fixed in 6.18.19 with commit 003df94bcc9227e8e930abd03ac7f63ac10033dc
	Issue introduced in 5.11 with commit 9ad9a52cce2828d932ae9495181e3d6414f72c07 and fixed in 6.19.9 with commit 5549611888f5ca2db5e8e692b57f30626ddf9898
	Issue introduced in 5.11 with commit 9ad9a52cce2828d932ae9495181e3d6414f72c07 and fixed in 7.0 with commit b795e68bf3073d67bebbb5a44d93f49efc5b8cc7

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-2026-43352
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/i3c/master/mipi-i3c-hci/dma.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/003df94bcc9227e8e930abd03ac7f63ac10033dc
	https://git.kernel.org/stable/c/5549611888f5ca2db5e8e692b57f30626ddf9898
	https://git.kernel.org/stable/c/b795e68bf3073d67bebbb5a44d93f49efc5b8cc7