Bug 2506806 (CVE-2026-64231)

Summary:	CVE-2026-64231 kernel: drm/msm/dsi: don't dump registers past the mapped region
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability-draft	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-07-24 16:04:38 UTC

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

drm/msm/dsi: don't dump registers past the mapped region

On DSI 6G platforms the IO address space is internally adjusted by
io_offset. Later this adjusted address might be used for memory dumping.
However the size that is used for memory dumping isn't adjusted to
account for the io_offset, leading to the potential access to the
unmapped region. Lower ctrl_size by the io_offset value to prevent
access past the mapped area.

 msm_disp_snapshot_add_block+0x1d4/0x3c8 [msm] (P)
 msm_dsi_host_snapshot+0x4c/0x78 [msm]
 msm_dsi_snapshot+0x28/0x50 [msm]
 msm_disp_snapshot_capture_state+0x74/0x140 [msm]
 msm_disp_snapshot_state_sync+0x60/0x90 [msm]
 _msm_disp_snapshot_work+0x30/0x90 [msm]
 kthread_worker_fn+0xdc/0x460
 kthread+0x120/0x140

Patchwork: https://patchwork.freedesktop.org/patch/721747/

Comment 1 Mauro Matteo Cascella 2026-07-28 11:13:09 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072419-CVE-2026-64231-b2c9@gregkh/T