CVE-2026-89945ASoC: cs35l34: drain threaded IRQ before runtime suspend

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/3be8380fb14d602cd833e5852e6d83c1e7eb1ceb
• https://git.kernel.org/stable/c/96982734e765c13c3db02067e1d5784682085f5c
• https://git.kernel.org/stable/c/5b063739619990d5de0c94c85d6e5be14e7cbdfe
• https://git.kernel.org/stable/c/f4bfd755c52dfa7584e6c9374206b71b8895c997
• https://git.kernel.org/stable/c/4fe8a91a9266f1321c2d31ce67940a4e8b93559e
• https://git.kernel.org/stable/c/5a4fe7a87841af23ba80bae31b80355b16926cf4
• https://git.kernel.org/stable/c/07a86575edc308e66b6c8873ed4a93ef3a063e55
• https://git.kernel.org/stable/c/4105a4c0678b2808fc8046b60321b4f1cc7dae75