5.5

CVE-2022-49942

wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

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().
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 3.13 < 4.9.328
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.293
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.258
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.213
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.142
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.66
Linux ≫ Linux Kernel Version >= 5.16 < 5.19.8
Linux ≫ Linux Kernel Version6.0 Updaterc1
Linux ≫ Linux Kernel Version6.0 Updaterc2
Linux ≫ Linux Kernel Version6.0 Updaterc3
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.22% 0.12
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

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