CVE-2026-89892
media: em28xx: defer audio-only extension registration
Description
In the Linux kernel, the following vulnerability has been resolved: media: em28xx: defer audio-only extension registration The audio-only path registers extensions while probing the primary device. For a dual-TS board, this happens before dev_next is created. The duplicate device inherits is_audio_only and is then independently inserted into em28xx_devlist. The list is intended to contain only primary devices: extension operations reach the secondary device through dev_next. The independently linked secondary can be freed during disconnect while its list node remains reachable, resulting in a use-after-free. Defer audio-only extension registration to the module-request work item. It runs only after probing has completed construction of the optional secondary device, so only the primary is registered and extension callbacks reach the secondary through dev_next.
INFO
Published Date :
Sept. 16, 2026, 11:16 a.m.
Last Modified :
Sept. 16, 2026, 11:16 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the kernel patch to defer audio-only extension registration.
- Ensure module-request work item is used for extension registration.
- Register only primary devices for extension operations.
- Use dev_next for secondary device extension callbacks.
References to Advisories, Solutions, and Tools
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CVE-2026-89892.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-89892 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-89892
weaknesses.
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Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 16, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: media: em28xx: defer audio-only extension registration The audio-only path registers extensions while probing the primary device. For a dual-TS board, this happens before dev_next is created. The duplicate device inherits is_audio_only and is then independently inserted into em28xx_devlist. The list is intended to contain only primary devices: extension operations reach the secondary device through dev_next. The independently linked secondary can be freed during disconnect while its list node remains reachable, resulting in a use-after-free. Defer audio-only extension registration to the module-request work item. It runs only after probing has completed construction of the optional secondary device, so only the primary is registered and extension callbacks reach the secondary through dev_next. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89892.json">CVE-2026-89892</a> Added Reference https://git.kernel.org/stable/c/0da1e627f4fc9d0e947fdae90913042120878923 Added Reference https://git.kernel.org/stable/c/1abe9524dec0fd26e9ceb8d586034d6f68dd8273 Added Reference https://git.kernel.org/stable/c/4666197ca4f7d80cd3b0292054fe45d76be9ba04 Added Reference https://git.kernel.org/stable/c/4e11c45dfdc72ab656067b1df8fcebaf52fd4715 Added Reference https://git.kernel.org/stable/c/95f76f51937fdfb0fc1e14cae606b1ef574a56f3 Added Reference https://git.kernel.org/stable/c/d06067ee32620f272cfb80c7bc7c572ad4e74724 Added Reference https://git.kernel.org/stable/c/f8d7e77d9c621b42a191c67a9b37bec23dc1d555 Added Reference https://git.kernel.org/stable/c/f9322ac9f862961d7f377b87ec26c8565af7e073