# CVE-2026-53192: ALSA: timer: Fix UAF at snd_timer_user_params()

> A use-after-free vulnerability in the Linux kernel ALSA timer allows local attackers to achieve code execution or privilege escalation via a race condition.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Jun 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-90660, BELL-CVE-2026-53192, DEBIAN-CVE-2026-53192, GHSA-jmf6-3v74-7x28, ROOT-OS-DEBIAN-11-CVE-2026-53192, ROOT-OS-DEBIAN-12-CVE-2026-53192, ROOT-OS-UBUNTU-2204-CVE-2026-53192, ROOT-OS-UBUNTU-2404-CVE-2026-53192, UBUNTU-CVE-2026-53192

## What is CVE-2026-53192?

CVE-2026-53192 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: timer: Fix UAF at snd_timer_user_params()

At releasing a timer object, e.g. when a userspace timer
(CONFIG_SND_UTIMER) gets closed and snd_timer_free() is called, it
tries to detach the timer instances and release the resources.
However, it's still possible that other in-flight tasks are holding
the timer instance where the to-be-deleted timer object is associated,
and this may lead to racy accesses.

Fortunately, most of ioctls dealing with the timer instance list
already have the protection with register_mutex, and this also avoids
such races.  But, SNDRV_TIMER_IOCTL_PARAMS isn't protected, hence the
concurrent ioctl may lead to use-after-free.

This patch just adds the guard with register_mutex to protect
snd_timer_user_params() for covering the code path as a quick
workaround.  It's no hot-path but rather a rarely issued ioctl, so the
performance penalty doesn't matter.

Weakness: CWE-416 (Use After Free), CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2026-53192?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2026-53192?

Apply the vendor's patch.

## Is CVE-2026-53192 being exploited?

There is no known exploitation of CVE-2026-53192 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-53192 and fix it if it is affected.

What it is: CVE-2026-53192 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-53192 in the wild and no public exploit code.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-53192/ (Markdown: https://insights.sbomify.com/CVE-2026-53192/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-53192
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-53192
- OSV: https://osv.dev/vulnerability/CVE-2026-53192

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-53192/
Summaries are generated and may contain mistakes; the official description above is the record.