linux-cve-announce - CVE-2026-23162: drm/xe/nvm: Fix double-free on aux add failure

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Message-ID: <2026021418-CVE-2026-23162-da25@gregkh>
Date: Sat, 14 Feb 2026 17:04:28 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23162: drm/xe/nvm: Fix double-free on aux add failure

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

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

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

drm/xe/nvm: Fix double-free on aux add failure

After a successful auxiliary_device_init(), aux_dev->dev.release
(xe_nvm_release_dev()) is responsible for the kfree(nvm). When
there is failure with auxiliary_device_add(), driver will call
auxiliary_device_uninit(), which call put_device(). So that the
.release callback will be triggered to free the memory associated
with the auxiliary_device.

Move the kfree(nvm) into the auxiliary_device_init() failure path
and remove the err goto path to fix below error.

"
[   13.232905] ==================================================================
[   13.232911] BUG: KASAN: double-free in xe_nvm_init+0x751/0xf10 [xe]
[   13.233112] Free of addr ffff888120635000 by task systemd-udevd/273

[   13.233120] CPU: 8 UID: 0 PID: 273 Comm: systemd-udevd Not tainted 6.19.0-rc2-lgci-xe-kernel+ #225 PREEMPT(voluntary)
...
[   13.233125] Call Trace:
[   13.233126]  <TASK>
[   13.233127]  dump_stack_lvl+0x7f/0xc0
[   13.233132]  print_report+0xce/0x610
[   13.233136]  ? kasan_complete_mode_report_info+0x5d/0x1e0
[   13.233139]  ? xe_nvm_init+0x751/0xf10 [xe]
...
"

v2: drop err goto path. (Alexander)

(cherry picked from commit a3187c0c2bbd947ffff97f90d077ac88f9c2a215)

The Linux kernel CVE team has assigned CVE-2026-23162 to this issue.


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

	Issue introduced in 6.17 with commit 7926ba2143d8fef40bb940232818c7363e33598c and fixed in 6.18.9 with commit 32887d8e4bc0696b3cb6c5915a42b39cfd3434f4
	Issue introduced in 6.17 with commit 7926ba2143d8fef40bb940232818c7363e33598c and fixed in 6.19 with commit 8a44241b0b83a6047c5448da1fff03fcc29496b5

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-2026-23162
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/gpu/drm/xe/xe_nvm.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/32887d8e4bc0696b3cb6c5915a42b39cfd3434f4
	https://git.kernel.org/stable/c/8a44241b0b83a6047c5448da1fff03fcc29496b5