What’s Vulnerable › Vulnerabilities

CVE-2022-49934: wifi: mac80211: Fix UAF in ieee80211_scan_rx()

• Severity: high (CVSS 7.8 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: 2025-06-18 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: Fix UAF in ieee80211_scan_rx() ieee80211_scan_rx() tries to access scan_req->flags after a null check, but a UAF is observed when the scan is completed and __ieee80211_scan_completed() executes, which then calls cfg80211_scan_done() leading to the freeing of scan_req. Since scan_req is rcu_dereference()'d, prevent the racing in __ieee80211_scan_completed() by ensuring that from mac80211's POV it is no longer accessed from an RCU read critical section before we call cfg80211_scan_done().

Affected products

• Linux kernel: from 3.19 before 4.9.330; from 4.10 before 4.14.295; from 4.15 before 4.19.260; from 4.20 before 5.4.215; from 5.5 before 5.10.142; from 5.11 before 5.15.66 — fixed in 4.14.295, 4.19.260, 4.9.330, 5.10.142, 5.15.66, 5.19.8

How to fix

Upgrade to a fixed version: Linux kernel 4.14.295, 4.19.260, 4.9.330, 5.10.142. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4abc8c07a065ecf771827bde3c63fbbe4aa0c08b
• https://git.kernel.org/stable/c/5d20c6f932f2758078d0454729129c894fe353e7
• https://git.kernel.org/stable/c/60deb9f10eec5c6a20252ed36238b55d8b614a2c
• https://git.kernel.org/stable/c/6eb181a64fdabf10be9e54de728876667da20255
• https://git.kernel.org/stable/c/78a07732fbb0934d14827d8f09b9aa6a49ee1aa9
• https://git.kernel.org/stable/c/9ad48cbf8b07f10c1e4a7a262b32a9179ae9dd2d
• https://git.kernel.org/stable/c/c0445feb80a4d0854898118fa01073701f8d356b
• https://git.kernel.org/stable/c/e0ff39448cea654843744c72c6780293c5082cb1

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