CVE-2022-49934: linux kernel Use-After-Free — Fix

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().

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.19 — 4.9.330
linux	linux_kernel	4.10 — 4.14.295
linux	linux_kernel	4.15 — 4.19.260
linux	linux_kernel	4.20 — 5.4.215
linux	linux_kernel	5.5 — 5.10.142
linux	linux_kernel	5.11 — 5.15.66
linux	linux_kernel	5.16 — 5.19.8
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2022-49934? +

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(). It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49934? +

CVE-2022-49934 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-49934? +

CVE-2022-49934 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49934? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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