What’s Vulnerable › Vulnerabilities
CVE-2021-47207: ALSA: gus: fix null pointer dereference on pointer block
- Severity: medium (CVSS 5.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-04-10 · updated 2026-06-17
- Weakness: CWE-476
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.
Affected products
- Linux kernel: before 4.4.293; from 4.5 before 4.9.291; from 4.10 before 4.14.256; from 4.15 before 4.19.218; from 4.20 before 5.4.162; from 5.5 before 5.10.82 — fixed in 4.14.256, 4.19.218, 4.4.293, 4.9.291, 5.10.82, 5.15.5
How to fix
Upgrade to a fixed version: Linux kernel 4.14.256, 4.19.218, 4.4.293, 4.9.291. Check the vendor advisory for mitigations.
References
- https://git.kernel.org/stable/c/16721797dcef2c7c030ffe73a07f39a65f9323c3
- https://git.kernel.org/stable/c/1ac6cd87d8ddd36c43620f82c4d65b058f725f0f
- https://git.kernel.org/stable/c/3e28e083dcdf03a18a083f8a47b6bb6b1604b5be
- https://git.kernel.org/stable/c/542fa721594a02d2aee0370a764d306ef48d030c
- https://git.kernel.org/stable/c/a0d21bb3279476c777434c40d969ea88ca64f9aa
- https://git.kernel.org/stable/c/ab4c1ebc40f699f48346f634d7b72b9c5193f315
- https://git.kernel.org/stable/c/c6d2cefdd05c4810c416fb8d384b5c377bd977bc
- https://git.kernel.org/stable/c/cb09c760c201f82df83babc92a5ffea0a01807fc
- https://git.kernel.org/stable/c/16721797dcef2c7c030ffe73a07f39a65f9323c3
- https://git.kernel.org/stable/c/1ac6cd87d8ddd36c43620f82c4d65b058f725f0f
- https://git.kernel.org/stable/c/3e28e083dcdf03a18a083f8a47b6bb6b1604b5be
- https://git.kernel.org/stable/c/542fa721594a02d2aee0370a764d306ef48d030c
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