Medium 5.5Published Apr 3, 2026

CVE-2026-31394mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations

Updated under an hour ago (Oct 26, 2026, 2:00 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations ieee80211_chan_bw_change() iterates all stations and accesses link->reserved.oper via sta->sdata->link[link_id]. For stations on AP_VLAN interfaces (e.g. 4addr WDS clients), sta->sdata points to the VLAN sdata, whose link never participates in chanctx reservations. This leaves link->reserved.oper zero-initialized with chan == NULL, causing a NULL pointer dereference in __ieee80211_sta_cap_rx_bw() when accessing chandef->chan->band during CSA. Resolve the VLAN sdata to its parent AP sdata using get_bss_sdata() before accessing link data. [also change sta->sdata in ARRAY_SIZE even if it doesn't matter]

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b27512368591fc959768df1f7dacf2a96b1bd036 before 65c25b588994dd422fea73fa322de56e1ae4a33b; from b27512368591fc959768df1f7dacf2a96b1bd036 before 5a86d4e920d9783a198e39cf53f0e410fba5fbd6; from b27512368591fc959768df1f7dacf2a96b1bd036 before 3c6629e859a2211a1fbb4868f915413f80001ca5; from b27512368591fc959768df1f7dacf2a96b1bd036 before 672e5229e1ecfc2a3509b53adcb914d8b024a853	CNA record
linux linux_kernel linux:linux_kernel	from 6.11 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.10; 7.0; 7.0; 7.0; 7.0	NVD

References

References

https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b	patch
https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6	patch
https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5	patch
https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.