CVE-2026-68280: drm/bridge: cdns-dsi: Replace deprecated UNIVERSAL_DEV_PM_OPS()
In the Linux kernel, the following vulnerability has been resolved:
drm/bridge: cdns-dsi: Replace deprecated UNIVERSALDEVPMOPS()
The deprecated UNIVERSALDEVPMOPS() macro uses the provided callbacks for both runtime PM and system sleep. This causes the DSI clocks to be disabled twice: once during runtime suspend and again during system suspend, resulting in a WARN message from the clock framework when attempting to disable already-disabled clocks.
[ 84.384540] clk:231:5 already disabled [ 84.388314] WARNING: CPU: 2 PID: 531 at /drivers/clk/clk.c:1181 clkcoredisable+0xa4/0xac ... [ 84.579183] Call trace: [ 84.581624] clkcoredisable+0xa4/0xac [ 84.585457] clkdisable+0x30/0x4c [ 84.588857] cdnsdsisuspend+0x20/0x58 [cdnsdsi] [ 84.593651] pmgenericsuspend+0x2c/0x44 [ 84.597661] tiscipdsuspend+0xbc/0x15c [ 84.601670] dpmruncallback+0x8c/0x14c [ 84.605588] devicesuspend+0x1a0/0x56c [ 84.609594] dpmsuspend+0x17c/0x21c [ 84.613165] dpmsuspendstart+0xa0/0xa8 [ 84.617083] suspenddevicesandenter+0x12c/0x634 [ 84.621872] pmsuspend+0x1fc/0x368
To address this issue, replace UNIVERSALDEVPMOPS() with RUNTIMEPMOPS(). Bridge and panel drivers should only deal with runtime PM, as the DRM framework manages system-wide power transitions through the bridge enable() and disable() hooks.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
In drivers/drm/bridge/cdns-dsi, replace the deprecated UNIVERSAL_DEV_PM_OPS() macro with the runtime PM approach using RUNTIME_PM_OPS() (so the bridge enable()/disable() hooks only handle runtime power management, not system sleep). This prevents attempting to disable already-disabled DSI clocks that triggers a WARNING from the clock framework.
Linux kernel DRM bridge driver: cdns-dsi PM operations macro (UNIVERSAL_DEV_PM_OPS) = Replace UNIVERSAL_DEV_PM_OPS() with runtime PM ops using RUNTIME_PM_OPS()
Event History
Frequently Asked Questions
What is the severity of CVE-2026-68280?
CVE-2026-68280 has a severity rating of 10, indicating a critical vulnerability.
How do I fix CVE-2026-68280?
To fix CVE-2026-68280, update your Linux kernel to the latest version where the vulnerability has been addressed.
What systems are affected by CVE-2026-68280?
CVE-2026-68280 affects systems running vulnerable versions of the Linux kernel that utilize the deprecated UNIVERSAL_DEV_PM_OPS() macro.
What kind of vulnerability is CVE-2026-68280?
CVE-2026-68280 is a vulnerability related to power management in the Linux kernel's DSI bridge driver.
Is there a workaround for CVE-2026-68280?
No official workaround is recommended for CVE-2026-68280, so applying the kernel update is the best mitigation.