CVE-2026-31394
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
36/100
Published: 2026-04-03
Modified: 2026-11-05
First seen: 2026-11-05
Status: active
Attack Surface
Low Complexity
No Interaction
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
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]
Weakness Classification (1)
Affected Software (10)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | b27512368591fc959768df1f7dacf2a96b1bd036 < 65c25b588994dd422fea73fa322de56e1ae4a33b |
| Linux | Linux | b27512368591fc959768df1f7dacf2a96b1bd036 < 5a86d4e920d9783a198e39cf53f0e410fba5fbd6 |
| Linux | Linux | b27512368591fc959768df1f7dacf2a96b1bd036 < 3c6629e859a2211a1fbb4868f915413f80001ca5 |
| Linux | Linux | b27512368591fc959768df1f7dacf2a96b1bd036 < 672e5229e1ecfc2a3509b53adcb914d8b024a853 |
| Linux | Linux | 6.11 |
| linux | linux_kernel | 6.11 – 6.12.78 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |