What’s Vulnerable › Vulnerabilities

CVE-2021-38206

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-08 · updated 2026-10-08
• Weakness: CWE-476

Description

The mac80211 subsystem in the Linux kernel before 5.12.13, when a device supporting only 5 GHz is used, allows attackers to cause a denial of service (NULL pointer dereference in the radiotap parser) by injecting a frame with 802.11a rates.

Affected products

• Linux kernel: before 5.12.13 — fixed in 5.12.13

How to fix

Upgrade to a fixed version: Linux kernel 5.12.13. Check the vendor advisory for mitigations.

References

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13
• https://github.com/torvalds/linux/commit/bddc0c411a45d3718ac535a070f349be8eca8d48
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.13
• https://github.com/torvalds/linux/commit/bddc0c411a45d3718ac535a070f349be8eca8d48

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