CVE-2026-31394 (GCVE-0-2026-31394)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-05-11 22:07
VLAI
Title
mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations
Summary
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]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b27512368591fc959768df1f7dacf2a96b1bd036 , < 65c25b588994dd422fea73fa322de56e1ae4a33b (git)
Affected: b27512368591fc959768df1f7dacf2a96b1bd036 , < 5a86d4e920d9783a198e39cf53f0e410fba5fbd6 (git)
Affected: b27512368591fc959768df1f7dacf2a96b1bd036 , < 3c6629e859a2211a1fbb4868f915413f80001ca5 (git)
Affected: b27512368591fc959768df1f7dacf2a96b1bd036 , < 672e5229e1ecfc2a3509b53adcb914d8b024a853 (git)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "net/mac80211/chan.c"
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    "dateReserved": "2026-03-09T15:48:24.085Z",
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}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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