CVE-2026-31394

MEDIUM EPSS 1.7%
Published Apr 3, 20262mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Apr 3, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
1.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥6.11  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.20
linuxlinux_kernel*≥6.19  –  <6.19.10
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853
    Patch