linux-cve-announce - CVE-2023-53755: dmaengine: ptdma: check for null desc before calling pt_cmd

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Message-ID: <2025120843-CVE-2023-53755-1c4b@gregkh>
Date: Mon,  8 Dec 2025 10:19:54 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53755: dmaengine: ptdma: check for null desc before calling pt_cmd_callback

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

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

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

dmaengine: ptdma: check for null desc before calling pt_cmd_callback

Resolves a panic that can occur on AMD systems, typically during host
shutdown, after the PTDMA driver had been exercised. The issue was
the pt_issue_pending() function is mistakenly assuming that there will
be at least one descriptor in the Submitted queue when the function
is called. However, it is possible that both the Submitted and Issued
queues could be empty, which could result in pt_cmd_callback() being
mistakenly called with a NULL pointer.
Ref: Bugzilla Bug 216856.

The Linux kernel CVE team has assigned CVE-2023-53755 to this issue.


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

	Issue introduced in 5.18 with commit 6fa7e0e836e23e2c758ac3930b040c8abbbf8a6f and fixed in 6.1.16 with commit 8ae2113702613207efc05453bc9a3df2b992bf45
	Issue introduced in 5.18 with commit 6fa7e0e836e23e2c758ac3930b040c8abbbf8a6f and fixed in 6.2.3 with commit 5bba023b1241c7af5d40447503a68de282ad5190
	Issue introduced in 5.18 with commit 6fa7e0e836e23e2c758ac3930b040c8abbbf8a6f and fixed in 6.3 with commit 928469986171a6f763b34b039427f5667ba3fd50

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-2023-53755
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/dma/ptdma/ptdma-dmaengine.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/8ae2113702613207efc05453bc9a3df2b992bf45
	https://git.kernel.org/stable/c/5bba023b1241c7af5d40447503a68de282ad5190
	https://git.kernel.org/stable/c/928469986171a6f763b34b039427f5667ba3fd50