Vulnerability Description
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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.11, < 6.12.78 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5Patch
- https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6Patch
- https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33bPatch
- https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853Patch
FAQ
What is CVE-2026-31394?
CVE-2026-31394 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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...
How severe is CVE-2026-31394?
CVE-2026-31394 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31394?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.