CVE-2026-46146 ALSA: usb-audio: Avoid potential endless loop in convert_chmap_v3()

What is CVE-2026-46146?

CVE-2026-46146 is a medium-severity denial of service vulnerability in Linux kernel, published on 28 May 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: usb-audio: Avoid potential endless loop in convert_chmap_v3()

The convert_chmap_v3() has a loop with its increment size of cs_desc->wLength, but we forgot to validate cs_desc->wLength itself, which may lead to potential endless loop by a malformed descriptor.

Add a proper size check to abort the loop for plugging the hole.

Weakness: CWE-835

Which versions are affected by CVE-2026-46146?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-46146?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-46146 being exploited?

There is no known exploitation of CVE-2026-46146 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-88890, BELL-CVE-2026-46146, DEBIAN-CVE-2026-46146, GHSA-pvph-jwxq-qcxw, ROOT-OS-DEBIAN-11-CVE-2026-46146, ROOT-OS-DEBIAN-12-CVE-2026-46146 and 3 more.