CVE-2026-31394

System crash via AP_VLAN link dereference

Published Apr 3, 2026 · Updated Apr 3, 2026

A NULL pointer dereference in mac80211 in Linux Kernel 6.11 and later affected releases allows local users to crash the system during CSA. ieee80211_chan_bw_change reads a zero-initialized AP_VLAN link reservation through VLAN station data, then __ieee80211_sta_cap_rx_bw dereferences its NULL channel. Triggering requires an AP_VLAN station, such as a four-address WDS client, and a channel switch announcement; the result is availability loss only.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in mac80211 in Linux Kernel 6.11 and later affected releases allows local users to crash the system during CSA. ieee80211_chan_bw_change reads a zero-initialized AP_VLAN link reservation through VLAN station data, then __ieee80211_sta_cap_rx_bw dereferences its NULL channel. Triggering requires an AP_VLAN station, such as a four-address WDS client, and a channel switch announcement; the result is availability loss only.

The record

CVE
CVE-2026-31394
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c6629e859a2211a1fbb4868f915413f80001ca5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a86d4e920d9783a198e39cf53f0e410fba5fbd6
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <65c25b588994dd422fea73fa322de56e1ae4a33b
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <672e5229e1ecfc2a3509b53adcb914d8b024a853

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c6629e859a2211a1fbb4868f915413f80001ca5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a86d4e920d9783a198e39cf53f0e410fba5fbd6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <65c25b588994dd422fea73fa322de56e1ae4a33b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <672e5229e1ecfc2a3509b53adcb914d8b024a853

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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