CVE-2026-53052 Overview
CVE-2026-53052 is a Linux kernel vulnerability in the ASoC (ALSA System on Chip) Qualcomm qdsp6 topology driver. The flaw resides in the topology handling code where the driver accesses private widget data without first verifying the widget type. Virtual widgets are not associated with a DSP graph, container, or module, so accessing their private data leads to incorrect memory access. The Linux kernel maintainers have resolved the issue by adding a widget type check before dereferencing the private data pointer.
Critical Impact
Incorrect memory access in the kernel audio subsystem can lead to kernel instability or denial of service on affected Qualcomm-based Linux systems.
Affected Products
- Linux kernel builds including the ASoC Qualcomm qdsp6 topology driver
- Qualcomm-based platforms (mobile, embedded, Snapdragon-class devices) running affected kernels
- Distribution kernels backporting the q6apm-lpass-dais / topology code prior to the fix
Discovery Timeline
- 2026-06-24 - CVE-2026-53052 published to NVD
- 2026-06-24 - Last updated in NVD database
Technical Details for CVE-2026-53052
Vulnerability Analysis
The issue lives in the Qualcomm DSP6 (qdsp6) ASoC topology code, which loads and binds audio routing widgets to backing DSP graph components. Each widget normally carries a private data pointer referencing a container, module, or graph node in the DSP. The topology driver previously assumed every widget it processed was backed by such a structure.
In practice, ASoC supports virtual widgets used for routing and mixer logic. These virtual widgets do not represent any DSP-side object and therefore have no associated graph, container, or module. When the driver iterated widgets and dereferenced the private data without first checking the widget type, it interpreted unrelated memory as a DSP descriptor.
Root Cause
The root cause is a missing type check in the topology widget handler. The driver dereferenced widget-specific private data before validating that the widget represented a real DSP-backed component. This produces an incorrect memory access (an invalid pointer dereference or read of unintended fields), which can destabilize the kernel.
Attack Vector
The attack surface requires interaction with the audio topology path, typically through audio configuration, firmware loading, or userspace ALSA control operations on systems using the Qualcomm DSP6 backend. There is no published exploit, and EPSS data lists this entry at 0.172% with a percentile of 6.864, indicating very low expected exploitation activity.
No verified proof-of-concept code is available. See the upstream commits for the precise patched logic: Kernel Git Commit 1ac9668, Commit 296810e, Commit 6d2491a, Commit 8e8cd78, Commit a1a24d4, and Commit d5bfdd2.
Detection Methods for CVE-2026-53052
Indicators of Compromise
- Kernel oops or panic messages referencing q6apm, q6dsp, or qdsp6 topology functions during audio initialization.
- Unexpected BUG: or Unable to handle kernel paging request traces tied to ASoC topology widget processing.
- Audio subsystem failures on Qualcomm platforms after loading topology firmware or ALSA UCM profiles.
Detection Strategies
- Inventory running Linux kernel versions on Qualcomm-based hosts and compare against the fixed commits in the stable trees.
- Review dmesg and persistent kernel logs (journalctl -k) for ASoC topology faults correlated with audio device initialization.
- Use configuration management tooling to flag systems still running pre-patch kernels in the affected stable series.
Monitoring Recommendations
- Forward kernel logs to a centralized logging or SIEM platform and alert on qdsp6, q6apm, or snd_soc_tplg error patterns.
- Monitor crash dumps and reboot events on edge or mobile fleets where Qualcomm DSP audio is in use.
- Track upstream linux-stable releases for the affected branches and validate patch deployment.
How to Mitigate CVE-2026-53052
Immediate Actions Required
- Identify hosts and devices running kernels with the unpatched ASoC qdsp6 topology code, particularly Qualcomm-based systems.
- Plan rollout of the stable kernel update containing the widget type check fix.
- Restrict untrusted local access on affected systems until the kernel is updated, as the bug is reachable through local audio subsystem interaction.
Patch Information
The fix adds a widget type check before accessing private data in the Qualcomm qdsp6 topology driver. It has been merged into multiple stable branches. Apply the kernel update containing one of the following commits: 1ac96689, 296810e9, 6d2491a5, 8e8cd78b, a1a24d4b, or d5bfdd28.
Workarounds
- If patching is not immediately possible, avoid loading topology firmware or ALSA UCM configurations that exercise virtual widgets on the qdsp6 path.
- Where the audio subsystem is not required, unload or disable the q6apm / qdsp6 modules to remove the affected code path.
- Limit local user access on impacted devices to reduce reachability of the audio topology code until the fix is applied.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
