CVE-2026-64039: drm/msm/snapshot: fix dumping of the unaligned regions

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

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

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

drm/msm/snapshot: fix dumping of the unaligned regions

The snapshotting code internally aligns data segment to 16 bytes. This
works fine for DPU code (where most of the regions are aligned), but
fails for snapshotting of the DSI data (because DSI data region is
shifted by 4 bytes). Fix the code by removing length alignment and by
accurately printing last registers in the region. While reworking the
code also fix the 16x memory overallocation in
msm_disp_state_dump_regs().

Patchwork: https://patchwork.freedesktop.org/patch/725449/

The Linux kernel CVE team has assigned CVE-2026-64039 to this issue.


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

	Issue introduced in 5.14 with commit 98659487b845c05b6bed85d881713545db674c7c and fixed in 5.15.209 with commit 8fb070cf95847b29ef6cb15ec2c0de2bf4704676
	Issue introduced in 5.14 with commit 98659487b845c05b6bed85d881713545db674c7c and fixed in 6.1.175 with commit cecd34e046121d788a70b5c8b4f8a88916637953
	Issue introduced in 5.14 with commit 98659487b845c05b6bed85d881713545db674c7c and fixed in 6.6.142 with commit 070e40acc59ef7bedba0314f59971ba87fcc8ab0
	Issue introduced in 5.14 with commit 98659487b845c05b6bed85d881713545db674c7c and fixed in 6.12.92 with commit 1ef79be774706dddcfcace0331fa7ff32a73c73e
	Issue introduced in 5.14 with commit 98659487b845c05b6bed85d881713545db674c7c and fixed in 6.18.34 with commit cdd1aaf0ee962f50810b9aef7928f2313989d55f
	Issue introduced in 5.14 with commit 98659487b845c05b6bed85d881713545db674c7c and fixed in 7.0.11 with commit 0c90ececfad3fc5c4c43a75ece0e2d736ab3def1
	Issue introduced in 5.14 with commit 98659487b845c05b6bed85d881713545db674c7c and fixed in 7.1 with commit 76824d2467feb1828b745d6add2541918d7be3da

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-2026-64039
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/msm/disp/msm_disp_snapshot_util.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/8fb070cf95847b29ef6cb15ec2c0de2bf4704676
	https://git.kernel.org/stable/c/cecd34e046121d788a70b5c8b4f8a88916637953
	https://git.kernel.org/stable/c/070e40acc59ef7bedba0314f59971ba87fcc8ab0
	https://git.kernel.org/stable/c/1ef79be774706dddcfcace0331fa7ff32a73c73e
	https://git.kernel.org/stable/c/cdd1aaf0ee962f50810b9aef7928f2313989d55f
	https://git.kernel.org/stable/c/0c90ececfad3fc5c4c43a75ece0e2d736ab3def1
	https://git.kernel.org/stable/c/76824d2467feb1828b745d6add2541918d7be3da