CVE-2022-49942 [Medium] | Security Bypass in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected When we are not connected to a channel, sending channel "switch" announcement doesn't make any sense. The BSS list is empty in that case. This causes the for loop in cfg80211_get_bss() to be bypassed, so the function returns NULL (check line 1424 of net/wireless/scan.c), causing the WARN_ON() in ieee80211_ibss_csa_beacon() to get triggered (check line 500 of net/mac80211/ibss.c), which was consequently reported on the syzkaller dashboard. Thus, check if we have an existing connection before generating the CSA beacon in ieee80211_ibss_finish_csa().

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-14	0.02%	0.06%	+0.04%
2	2025-06-18	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-14

0.02%

0.06%

+0.04%

2025-06-18

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

3.6

[email protected]

OS Trackers for CVE-2022-49942

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49942 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2022-49942
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-49942
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2022-49942/
`ubuntu`	medium	CVE-2022-49942 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, released 151, ignored 150, not-affected 100, needed 4, needs-triage 1.	https://ubuntu.com/security/CVE-2022-49942

Affected software / configurations for CVE-2022-49942

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 3.13, < 4.9.328	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.10, < 4.14.293	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.258	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.213	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.142	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.66	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 5.19.8	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.0	cpe:2.3:o:linux:linux_kernel:6.0:rc1::::::
linux	linux_kernel	6.0	cpe:2.3:o:linux:linux_kernel:6.0:rc2::::::
linux	linux_kernel	6.0	cpe:2.3:o:linux:linux_kernel:6.0:rc3::::::

References for CVE-2022-49942

URL	Tags
https://git.kernel.org/stable/c/15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0	Patch
https://git.kernel.org/stable/c/1691a48aef0a82d1754b9853dae7e3f5cacdf70b	Patch
https://git.kernel.org/stable/c/552ba102a6898630a7d16887f29e606d6fabe508	Patch
https://git.kernel.org/stable/c/66689c5c02acd4d76c28498fe220998610aec61e	Patch
https://git.kernel.org/stable/c/864e280cb3a9a0f5212b16ef5057c4e692f7039d	Patch
https://git.kernel.org/stable/c/cdb9a8da9b84800eb15506cd9363cf0cf059e677	Patch
https://git.kernel.org/stable/c/d9eb37db6a28b59a95a3461450ee209654c5f95b	Patch
https://git.kernel.org/stable/c/dd649b49219a0388cc10fc40e4c2ea681566a780	Patch

URL

CVE-2022-49942 | wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

Exploit prediction scoring system (EPSS) score for CVE-2022-49942

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49942

Weakness enumeration for CVE-2022-49942

OS Trackers for CVE-2022-49942

Affected software / configurations for CVE-2022-49942

References for CVE-2022-49942