CVE-2026-89945 ASoC: cs35l34: drain threaded IRQ before runtime suspend
A race condition in the Linux kernel cs35l34 audio codec driver allows a local attacker to cause a denial of service by triggering a use-after-free scenario during runtime suspend.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-89945?
CVE-2026-89945 is a vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ASoC: cs35l34: drain threaded IRQ before runtime suspend
cs35l34_runtime_suspend() currently switches the codec into regcache_cache_only(true), asserts reset low, and powers the device off without first quiescing the threaded IRQ registered by devm_request_threaded_irq(). That leaves a window where cs35l34_irq_thread() can still run after suspend has removed live hardware access.
A running system can reach this during runtime PM while the driver still has critical fault IRQs unmasked. If the threaded handler runs in that window, it reads volatile INT_STATUS_1..4 after cache_only has been enabled, ignores the regmap_read() failures, and can still execute the PROT_RELEASE_CTL release sequence or the BST fault power-down writes.
Use disable_irq() before entering cache_only/reset-low/power-off so any in-flight threaded handler is drained and no new IRQ thread can run while the device is suspended. Re-enable the IRQ only after runtime_resume() has restored live register access with regcache_sync(). Since probe only logs request_threaded_irq() failures and keeps going, track whether the IRQ was actually installed before disabling or re-enabling it.
Which versions are affected by CVE-2026-89945?
How do I fix CVE-2026-89945?
Apply the vendor's patch.
Is CVE-2026-89945 being exploited?
There is no known exploitation of CVE-2026-89945 in the wild and no public exploit code.
Sources
Also known as AZL-101454, BELL-CVE-2026-89945, DEBIAN-CVE-2026-89945, GHSA-w3mv-pmf4-r863, UBUNTU-CVE-2026-89945.