CVE-2021-47207 ALSA: gus: fix null pointer dereference on pointer block

What is CVE-2021-47207?

CVE-2021-47207 is a medium-severity vulnerability in Linux kernel, published on 10 Apr 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: gus: fix null pointer dereference on pointer block

The pointer block return from snd_gf1_dma_next_block could be null, so there is a potential null pointer dereference issue. Fix this by adding a null check before dereference.

Weakness: CWE-476

Which versions are affected by CVE-2021-47207?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47207?

Apply the vendor's patch.

Is CVE-2021-47207 being exploited?

There is no known exploitation of CVE-2021-47207 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-2021-47207, GHSA-8963-6x33-4w7x, UBUNTU-CVE-2021-47207.