Bug 2495954 (CVE-2026-53350)

Summary: CVE-2026-53350 kernel: ASoC: wm_adsp: Fix NULL dereference when removing firmware controls
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Advanced Linux Sound Architecture (ASoC) Wolfson Microelectronics Audio Digital Signal Processor (wm_adsp) driver. The `wm_adsp_control_remove()` function attempts to clean up private control data without verifying if the pointer to this data is null. This can occur when certain controls are created without associated private data. An attacker could potentially trigger a NULL dereference, leading to system instability or a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-07-01 14:03:23 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ASoC: wm_adsp: Fix NULL dereference when removing firmware controls

In wm_adsp_control_remove() check that the priv pointer is not NULL
before attempting to cleanup what it points to.

When cs_dsp creates a control it calls wm_adsp_control_add_cb() so that
wm_adsp can create its own private control data. There are two cases
where private data is not created:

1. The control is a SYSTEM control, so an ALSA control is not created.

2. The codec driver has registered a control_add() callback that
   hides the control, so wm_adsp_control_add() is not called.

When cs_dsp_remove destroys its control list it calls
wm_adsp_control_remove() for each control. But wm_adsp_control_remove()
was attempting to cleanup the private data pointed to by cs_ctl->priv
without checking the pointer for NULL.
Comment 1 Mauro Matteo Cascella 2026-07-01 16:13:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026070146-CVE-2026-53350-dcd9@gregkh/T