CVE-2026-23213 - drm/amd/pm: Disable MMIO access during SMU Mode 1 reset

Back Back to CVE browser

MEDIUM

drm/amd/pm: Disable MMIO access during SMU Mode 1 reset

Published Feb 18, 2026

5.5

MEDIUM

CVSS 3.1

EPSS 0.12%

Description

During Mode 1 reset, the ASIC undergoes a reset cycle and becomes temporarily inaccessible via PCIe. Any attempt to access MMIO registers during this window (e.g., from interrupt handlers or other driver threads) can result in uncompleted PCIe transactions, leading to NMI panics or system hangs.

To prevent this, set the `no_hw_access` flag to true immediately after triggering the reset. This signals other driver components to skip register accesses while the device is offline.

A memory barrier `smp_mb()` is added to ensure the flag update is globally visible to all cores before the driver enters the sleep/wait state.

(cherry picked from commit 7edb503fe4b6d67f47d8bb0dfafb8e699bb0f8a4)

Affected products

Vendor Linux Product Linux Default
unaffected
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
Vendor Linux Product Linux Default
affected
- Version
  5.9
  Status
  affected
  Constraints
  -
- Version
  0
  Status
  unaffected
  Constraints
  <5.9
- Version
  6.12.70
  Status
  unaffected
  Constraints
  <=6.12.*
- Version
  6.18.10
  Status
  unaffected
  Constraints
  <=6.18.*
- Version
  6.19
  Status
  unaffected
  Constraints
  <=*

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Linux

unaffected

Version	Status	Constraints
	affected
	affected
	affected

Linux

affected

Version	Status	Constraints
5.9	affected	-
0	unaffected	<5.9
6.12.70	unaffected	<=6.12.*
6.18.10	unaffected	<=6.18.*
6.19	unaffected	<=*

Red Hat Enterprise Linux 10

kernel

Fix deferred
Red Hat Enterprise Linux 6

kernel

Out of support scope
Red Hat Enterprise Linux 7

kernel

Fix deferred
Red Hat Enterprise Linux 7

kernel-rt

Fix deferred
Red Hat Enterprise Linux 8

kernel

Fix deferred
Red Hat Enterprise Linux 8

kernel-rt

Fix deferred
Red Hat Enterprise Linux 9

kernel

Fix deferred
Red Hat Enterprise Linux 9

kernel-rt

Fix deferred

Product	Package	State	Advisory
Red Hat Enterprise Linux 10	kernel	Fix deferred	n/a
Red Hat Enterprise Linux 6	kernel	Out of support scope	n/a
Red Hat Enterprise Linux 7	kernel	Fix deferred	n/a
Red Hat Enterprise Linux 7	kernel-rt	Fix deferred	n/a
Red Hat Enterprise Linux 8	kernel	Fix deferred	n/a
Red Hat Enterprise Linux 8	kernel-rt	Fix deferred	n/a
Red Hat Enterprise Linux 9	kernel	Fix deferred	n/a
Red Hat Enterprise Linux 9	kernel-rt	Fix deferred	n/a

Remediation

No remediation recorded yet.

Weaknesses (0)

No CWE recorded.

References (8)

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2026-23213		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2440642		Issue Tracking
https://git.kernel.org/stable/c/0de604d0357d0d22cbf03af1077d174b641707b6		Patch
https://git.kernel.org/stable/c/c1853ebbec980d5c05d431bfd6ded73b1363fd00		Patch
https://git.kernel.org/stable/c/cd7ff7fd3e4b77f0b5a292e0926532eaa07c5162		Patch
https://lore.kernel.org/linux-cve-announce/2026021800-CVE-2026-23213-c699@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-23213
https://www.cve.org/CVERecord?id=CVE-2026-23213