CVE-2026-89945: Linux Vulnerability

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= c1124c09e1035cabdbc17d4538ae6f922086fec9, < 3be8380fb14d602cd833e5852e6d83c1e7eb1ceb; >= c1124c09e1035cabdbc17d4538ae6f922086fec9, < 96982734e765c13c3db02067e1d5784682085f5c; >= c1124c09e1035cabdbc17d4538ae6f922086fec9, < 5b063739619990d5de0c94c85d6e5be14e7cbdfe; >= c1124c09e1035cabdbc17d4538ae6f922086fec9, < f4bfd755c52dfa7584e6c9374206b71b8895c997; >= c1124c09e1035cabdbc17d4538ae6f922086fec9, < 4fe8a91a9266f1321c2d31ce67940a4e8b93559e; >= c1124c09e1035cabdbc17d4538ae6f922086fec9, < 5a4fe7a87841af23ba80bae31b80355b16926cf4; >= c1124c09e1035cabdbc17d4538ae6f922086fec9, < 07a86575edc308e66b6c8873ed4a93ef3a063e55; >= c1124c09e1035cabdbc17d4538ae6f922086fec9, < 4105a4c0678b2808fc8046b60321b4f1cc7dae75
Linux	Linux	4.10

References

Timeline

Published: Sep 16, 2026
Last Modified: Sep 16, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-89945?

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.

How severe is CVE-2026-89945?

Severity scoring for CVE-2026-89945 is pending analysis.

How do I fix CVE-2026-89945?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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