What’s Vulnerable › Vulnerabilities

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

• 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: 2024-05-21 · updated 2026-06-17
• Weakness: CWE-476

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.

Affected products

• Linux kernel: before 5.4.134; from 5.5 before 5.10.52; from 5.11 before 5.12.19; from 5.13 before 5.13.4 — fixed in 5.10.52, 5.12.19, 5.13.4, 5.4.134

How to fix

Upgrade to a fixed version: Linux kernel 5.10.52, 5.12.19, 5.13.4, 5.4.134. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/7d7f30cf182e55023fa8fde4c084b2d37c6be69d
• https://git.kernel.org/stable/c/82e5ee742fdd8874fe996181b87fafe1eb5f1196
• https://git.kernel.org/stable/c/88262229b778f4f7a896da828d966f94dcb35d19
• https://git.kernel.org/stable/c/bee295f5e03510252d18b25cc1d26230256eb87a
• https://git.kernel.org/stable/c/cae0cf651adccee2c3f376e78f30fbd788d0829f
• https://git.kernel.org/stable/c/7d7f30cf182e55023fa8fde4c084b2d37c6be69d
• https://git.kernel.org/stable/c/82e5ee742fdd8874fe996181b87fafe1eb5f1196
• https://git.kernel.org/stable/c/88262229b778f4f7a896da828d966f94dcb35d19
• https://git.kernel.org/stable/c/bee295f5e03510252d18b25cc1d26230256eb87a
• https://git.kernel.org/stable/c/cae0cf651adccee2c3f376e78f30fbd788d0829f

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