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CVE-2026-89895
media: cobalt: Avoid freeing ALSA private data twice
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: media: cobalt: Avoid freeing ALSA private data twice snd_cobalt_card_create() stores cobsc in sc->private_data and installs snd_cobalt_card_private_free() as sc->private_free. From that point, snd_card_free(sc) releases cobsc through the ALSA card cleanup path. If cobalt_alsa_init() fails after snd_cobalt_card_create(), the err_exit_free path calls snd_card_free(sc) and then kfree(cobsc). That second free releases the same object again. Remove the explicit kfree(cobsc) and leave ownership with the ALSA card. This issue was found by a static analysis checker and confirmed by manual source review.

Details
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
Impact
Affected Products

The following products are affected by CVE-2026-89895 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Remove explicit free of ALSA private data to prevent double-free issues.
  • Remove the explicit kfree(cobsc) call.
  • Leave ALSA card responsible for freeing private data.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-89895.

URL Resource
https://git.kernel.org/stable/c/3a7d6b9c4cb5ac18cbd3f1c7f8c7b159c42ba0b1
https://git.kernel.org/stable/c/42e00371f83c3fc7b99a36bf0229c74ad5d3c7d8
https://git.kernel.org/stable/c/61dfa8ded5efc3a25d331fa9ce5cebb85531fe70
https://git.kernel.org/stable/c/6cbc8a73b3464ebeccc49987b7233b6b087b8504
https://git.kernel.org/stable/c/75bbf45e3a954e292ae26832d2df40ca2e3ee452
https://git.kernel.org/stable/c/8c6610e230b9355cf7df5a338a0592c0f088c00b
https://git.kernel.org/stable/c/cb1218da234ea15fa14d90e2d049d686874d7aa3
https://git.kernel.org/stable/c/fe65028ee72a7e07e572b351891bd7a1f8917d33
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-89895 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-2026-89895 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-89895 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-89895 vulnerability over time.

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.

  • 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: cobalt: Avoid freeing ALSA private data twice snd_cobalt_card_create() stores cobsc in sc->private_data and installs snd_cobalt_card_private_free() as sc->private_free. From that point, snd_card_free(sc) releases cobsc through the ALSA card cleanup path. If cobalt_alsa_init() fails after snd_cobalt_card_create(), the err_exit_free path calls snd_card_free(sc) and then kfree(cobsc). That second free releases the same object again. Remove the explicit kfree(cobsc) and leave ownership with the ALSA card. This issue was found by a static analysis checker and confirmed by manual source review.
    Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/89xxx/CVE-2026-89895.json">CVE-2026-89895</a>
    Added Reference https://git.kernel.org/stable/c/3a7d6b9c4cb5ac18cbd3f1c7f8c7b159c42ba0b1
    Added Reference https://git.kernel.org/stable/c/42e00371f83c3fc7b99a36bf0229c74ad5d3c7d8
    Added Reference https://git.kernel.org/stable/c/61dfa8ded5efc3a25d331fa9ce5cebb85531fe70
    Added Reference https://git.kernel.org/stable/c/6cbc8a73b3464ebeccc49987b7233b6b087b8504
    Added Reference https://git.kernel.org/stable/c/75bbf45e3a954e292ae26832d2df40ca2e3ee452
    Added Reference https://git.kernel.org/stable/c/8c6610e230b9355cf7df5a338a0592c0f088c00b
    Added Reference https://git.kernel.org/stable/c/cb1218da234ea15fa14d90e2d049d686874d7aa3
    Added Reference https://git.kernel.org/stable/c/fe65028ee72a7e07e572b351891bd7a1f8917d33
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.