CVE-2026-31394mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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]
Timeline
ID reserved
By Linux
- 25 days later
· 25 days later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected b27512368591fc959768df1f7dacf2a96b1bd036 – < 65c25b588994dd422fea73fa322de56e1ae4a33b
- affected b27512368591fc959768df1f7dacf2a96b1bd036 – < 5a86d4e920d9783a198e39cf53f0e410fba5fbd6
- affected b27512368591fc959768df1f7dacf2a96b1bd036 – < 3c6629e859a2211a1fbb4868f915413f80001ca5
- affected b27512368591fc959768df1f7dacf2a96b1bd036 – < 672e5229e1ecfc2a3509b53adcb914d8b024a853
- affected 6.11
- unaffected < 6.11
- unaffected 6.12.78 – ≤ 6.12.*
- unaffected 6.18.20 – ≤ 6.18.*
- unaffected 6.19.10 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References4
- https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b (opens in a new tab)
- https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6 (opens in a new tab)
- https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5 (opens in a new tab)
- https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-18770 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-31394)Record last updated .