What’s Vulnerable › Vulnerabilities

CVE-2021-47091: mac80211: fix locking in ieee80211_start_ap error path

• 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: 2024-03-04 · updated 2026-06-17
• Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: mac80211: fix locking in ieee80211_start_ap error path We need to hold the local->mtx to release the channel context, as even encoded by the lockdep_assert_held() there. Fix it.

Affected products

• Linux kernel: from 5.10 before 5.10.89; from 5.11 before 5.15.12; 5.16-rc1, 5.16-rc2, 5.16-rc3, 5.16-rc4, 5.16-rc5, 5.16-rc6 — fixed in 5.10.89, 5.15.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.89, 5.15.12. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/87a270625a89fc841f1a7e21aae6176543d8385c
• https://git.kernel.org/stable/c/ac61b9c6c0549aaeb98194cf429d93c41bfe5f79
• https://git.kernel.org/stable/c/c1d1ec4db5f7264cfc21993e59e8f2dcecf4b44f
• https://git.kernel.org/stable/c/87a270625a89fc841f1a7e21aae6176543d8385c
• https://git.kernel.org/stable/c/ac61b9c6c0549aaeb98194cf429d93c41bfe5f79
• https://git.kernel.org/stable/c/c1d1ec4db5f7264cfc21993e59e8f2dcecf4b44f

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