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CVE-2026-89944: ASoC: hdac_hda: Fix hlink refcount leak on component registration failure

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: hdac_hda: Fix hlink refcount leak on component registration failure hdac_hda_dev_probe() gets the HDA link with snd_hdac_ext_bus_link_get() before registering the ASoC component. If component registration fails, the function returns without dropping the link reference. Always call snd_hdac_ext_bus_link_put() after the registration attempt so the reference taken during probe is balanced on both success and failure.

Affected products

• Linux: 4.20 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1c2625fbdeb17376f76c57b7669e6aa6500a7149
• https://git.kernel.org/stable/c/60b5824ae259ad15f7878e4e763ec31ba4db55f2
• https://git.kernel.org/stable/c/6ad4892c4f5cb437a928a02f5b7d37d496aa9268
• https://git.kernel.org/stable/c/7eef9ae3b4ef782557526dd8ba0c206f028d8c2f
• https://git.kernel.org/stable/c/cb6b0b1a9d5a61ef841739d42c6211094e9c8e2c
• https://git.kernel.org/stable/c/e8ea01a0457080b0cc7c69c430c0ab65d84dc377

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