Bug 2461504 (CVE-2026-31550) - CVE-2026-31550 kernel: pmdomain: bcm: bcm2835-power: Increase ASB control timeout
Summary: CVE-2026-31550 kernel: pmdomain: bcm: bcm2835-power: Increase ASB control tim...
Keywords:
Status: NEW
Alias: CVE-2026-31550
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-24 15:05 UTC by OSIDB Bzimport
Modified: 2026-04-24 17:10 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-04-24 15:05:25 UTC
In the Linux kernel, the following vulnerability has been resolved:

pmdomain: bcm: bcm2835-power: Increase ASB control timeout

The bcm2835_asb_control() function uses a tight polling loop to wait
for the ASB bridge to acknowledge a request. During intensive workloads,
this handshake intermittently fails for V3D's master ASB on BCM2711,
resulting in "Failed to disable ASB master for v3d" errors during
runtime PM suspend. As a consequence, the failed power-off leaves V3D in
a broken state, leading to bus faults or system hangs on later accesses.

As the timeout is insufficient in some scenarios, increase the polling
timeout from 1us to 5us, which is still negligible in the context of a
power domain transition. Also, replace the open-coded ktime_get_ns()/
cpu_relax() polling loop with readl_poll_timeout_atomic().


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