CVE-2026-89945 - Vulnerability Details

- ASoC: cs35l34: drain threaded IRQ before runtime suspend

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.

Published: 2026-09-16

Score: n/a

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The cs35l34 audio codec driver fails to drain its threaded interrupt request before entering runtime suspend. As a result, the interrupt handler can still execute after the device has been powered down and register access has been disabled. The handler reads volatile registers and may trigger firmware power‑down or release sequences, potentially corrupting the device state. This flaw is a race condition that could lead to unintended device behavior or system crashes.

Affected Systems

The vulnerability affects Linux kernel drivers implementing the Cirrus Logic CS35L34 codec. All kernel versions that include the cs35l34 driver without the patch are impacted; the flaw is specific to the ASoC subsystem in the Linux kernel.

Risk and Exploitability

The EPSS score is below 1 %, indicating a very low probability of exploitation in the wild, and the vulnerability is not listed in the CISA KEV catalog. The flaw requires local privileged access to the kernel to exploit effectively and occurs during the runtime power‑management cycle. The CVSS score is not provided, but the presence of a race condition that can cause device corruption or crash warrants attention from system administrators.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`c1124c09e1035cabdbc17d4538ae6f922086fec9`	affected	< 3be8380fb14d602cd833e5852e6d83c1e7eb1ceb
`c1124c09e1035cabdbc17d4538ae6f922086fec9`	affected	< 96982734e765c13c3db02067e1d5784682085f5c
`c1124c09e1035cabdbc17d4538ae6f922086fec9`	affected	< 5b063739619990d5de0c94c85d6e5be14e7cbdfe
`c1124c09e1035cabdbc17d4538ae6f922086fec9`	affected	< f4bfd755c52dfa7584e6c9374206b71b8895c997
`c1124c09e1035cabdbc17d4538ae6f922086fec9`	affected	< 4fe8a91a9266f1321c2d31ce67940a4e8b93559e
`c1124c09e1035cabdbc17d4538ae6f922086fec9`	affected	< 5a4fe7a87841af23ba80bae31b80355b16926cf4
`c1124c09e1035cabdbc17d4538ae6f922086fec9`	affected	< 07a86575edc308e66b6c8873ed4a93ef3a063e55
`c1124c09e1035cabdbc17d4538ae6f922086fec9`	affected	< 4105a4c0678b2808fc8046b60321b4f1cc7dae75

Linux

affected

Version	Status	Constraints
`4.10`	affected	—
`0`	unaffected	< 4.10
`5.10.270`	unaffected	≤ 5.10.*
`5.15.221`	unaffected	≤ 5.15.*
`6.1.188`	unaffected	≤ 6.1.*
`6.6.157`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.51`	unaffected	≤ 6.18.*
`7.2.5`	unaffected	≤ 7.2.*
`7.3-rc1`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[c1124c09e1035cabdbc17d4538ae6f922086fec9,3be8380fb14d602cd833e5852e6d83c1e7eb1ceb)`	affected	code_commit	—
`[c1124c09e1035cabdbc17d4538ae6f922086fec9,96982734e765c13c3db02067e1d5784682085f5c)`	affected	code_commit	—
`[c1124c09e1035cabdbc17d4538ae6f922086fec9,5b063739619990d5de0c94c85d6e5be14e7cbdfe)`	affected	code_commit	—
`[c1124c09e1035cabdbc17d4538ae6f922086fec9,f4bfd755c52dfa7584e6c9374206b71b8895c997)`	affected	code_commit	—
`[c1124c09e1035cabdbc17d4538ae6f922086fec9,4fe8a91a9266f1321c2d31ce67940a4e8b93559e)`	affected	code_commit	—
`[c1124c09e1035cabdbc17d4538ae6f922086fec9,5a4fe7a87841af23ba80bae31b80355b16926cf4)`	affected	code_commit	—
`[c1124c09e1035cabdbc17d4538ae6f922086fec9,07a86575edc308e66b6c8873ed4a93ef3a063e55)`	affected	code_commit	—
`[c1124c09e1035cabdbc17d4538ae6f922086fec9,4105a4c0678b2808fc8046b60321b4f1cc7dae75)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`4.10`	affected	generic	—
`[0,4.10)`	unaffected	generic	—
`[5.10.270,5.11.0)`	unaffected	semver	—
`[5.15.221,5.16.0)`	unaffected	semver	—
`[6.1.188,6.2.0)`	unaffected	semver	—
`[6.6.157,6.7.0)`	unaffected	semver	—
`[6.12.110,6.13.0)`	unaffected	semver	—
`[6.18.51,6.19.0)`	unaffected	semver	—
`[7.2.5,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	generic	—

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Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Apply a Linux kernel update that includes the cs35l34 runtime suspend IRQ draining patch.
Disable runtime suspend for the cs35l34 device to eliminate the race window.
If an immediate kernel upgrade is not feasible, consider disabling the cs35l34 driver or avoiding usage of the codec until a patched kernel is available.

Generated by OpenCVE AI on September 18, 2026 at 08:08 UTC.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DSA	DSA-6528-1	linux security update

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00211.

Key SSVC decision points have not yet been added.

References

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

History

Fri, 18 Sep 2026 08:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-362 CWE-416

Wed, 16 Sep 2026 10:45:00 +0000

Type	Values Removed	Values Added
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.
Title		ASoC: cs35l34: drain threaded IRQ before runtime suspend
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/07a86575edc308e66b6c8873ed4a93ef3a063e55 https://git.kernel.org/stable/c/3be8380fb14d602cd833e5852e6d83c1e7eb1ceb https://git.kernel.org/stable/c/4105a4c0678b2808fc8046b60321b4f1cc7dae75 https://git.kernel.org/stable/c/4fe8a91a9266f1321c2d31ce67940a4e8b93559e https://git.kernel.org/stable/c/5a4fe7a87841af23ba80bae31b80355b16926cf4 https://git.kernel.org/stable/c/5b063739619990d5de0c94c85d6e5be14e7cbdfe https://git.kernel.org/stable/c/96982734e765c13c3db02067e1d5784682085f5c https://git.kernel.org/stable/c/f4bfd755c52dfa7584e6c9374206b71b8895c997

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-09-16T10:32:31.951Z

Updated: 2026-09-16T10:32:31.951Z

Reserved: 2026-09-11T19:38:34.777Z

Link: CVE-2026-89945

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-16T11:17:04.383

Modified: 2026-09-16T11:17:04.383

Link: CVE-2026-89945

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-18T08:30:06Z

Weaknesses

CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416
Use After Free

Impact

Affected Systems

Risk and Exploitability

Tracking

Subscriptions

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