CVE-2021-47332 ALSA: usx2y: Don't call free_pages_exact() with NULL address

What is CVE-2021-47332?

CVE-2021-47332 is a medium-severity vulnerability in Linux kernel, published on 21 May 2024. 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: usx2y: Don't call free_pages_exact() with NULL address

Unlike some other functions, we can't pass NULL pointer to free_pages_exact(). Add a proper NULL check for avoiding possible Oops.

Weakness: CWE-476

Which versions are affected by CVE-2021-47332?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47332?

Apply the vendor's patch.

Is CVE-2021-47332 being exploited?

There is no known exploitation of CVE-2021-47332 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 DEBIAN-CVE-2021-47332, GHSA-pmrx-2gv3-hv52, UBUNTU-CVE-2021-47332.