5.5

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

Analyzed
AliasesUBUNTU-CVE-2022-49942DEBIAN-CVE-2022-49942
Published 18-06-2025Last modified 11-05-2026

Vulnerability summary

CVE-2022-49942 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 18% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.26%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 6
RHSA-2023:2458RHSA-2023:2951SUSE-SU-2025:02264-1SUSE-SU-2025:02308-1SUSE-SU-2025:02320-1SUSE-SU-2025:02321-1

Timeline

  1. 18-06-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

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().

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.26% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu111 products
  • linuxAll versions (No fix recorded) | < 4.15.0-201.212 | < 5.4.0-136.153 | < 5.15.0-57.63
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 4.15.0-1147.159 | < 5.4.0-1093.101 | < 5.15.0-1027.31
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ cd7760e62c2ac8581f050b2d36501d1a60beaf83, < cdb9a8da9b84800eb15506cd9363cf0cf059e677 | ≥ cd7760e62c2ac8581f050b2d36501d1a60beaf83, < 1691a48aef0a82d1754b9853dae7e3f5cacdf70b | ≥ cd7760e62c2ac8581f050b2d36501d1a60beaf83, < d9eb37db6a28b59a95a3461450ee209654c5f95b | ≥ cd7760e62c2ac8581f050b2d36501d1a60beaf83, < 66689c5c02acd4d76c28498fe220998610aec61e | ≥ cd7760e62c2ac8581f050b2d36501d1a60beaf83, < dd649b49219a0388cc10fc40e4c2ea681566a780 | ≥ cd7760e62c2ac8581f050b2d36501d1a60beaf83, < 552ba102a6898630a7d16887f29e606d6fabe508 | ≥ cd7760e62c2ac8581f050b2d36501d1a60beaf83, < 864e280cb3a9a0f5212b16ef5057c4e692f7039d | ≥ cd7760e62c2ac8581f050b2d36501d1a60beaf83, < 15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0 | 3.13
  • linux_kernel≥ 3.13, < 4.9.328 | ≥ 4.10, < 4.14.293 | ≥ 4.15, < 4.19.258 | ≥ 4.20, < 5.4.213 | ≥ 5.5, < 5.10.142 | ≥ 5.11, < 5.15.66 | ≥ 5.16, < 5.19.8 | 6.0:rc1 | 6.0:rc2 | 6.0:rc3
Debian1 product
  • linux< 6.0.2-1

3 vendors · 114 products

References

11 links
Show all 11 references