{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "b27512368591fc959768df1f7dacf2a96b1bd036"
            },
            {
              "fixed": "65c25b588994dd422fea73fa322de56e1ae4a33b"
            },
            {
              "fixed": "5a86d4e920d9783a198e39cf53f0e410fba5fbd6"
            },
            {
              "fixed": "3c6629e859a2211a1fbb4868f915413f80001ca5"
            },
            {
              "fixed": "672e5229e1ecfc2a3509b53adcb914d8b024a853"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.11.0"
            },
            {
              "fixed": "6.12.78"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.20"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31394.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations\n\nieee80211_chan_bw_change() iterates all stations and accesses\nlink-\u003ereserved.oper via sta-\u003esdata-\u003elink[link_id]. For stations on\nAP_VLAN interfaces (e.g. 4addr WDS clients), sta-\u003esdata points to\nthe VLAN sdata, whose link never participates in chanctx reservations.\nThis leaves link-\u003ereserved.oper zero-initialized with chan == NULL,\ncausing a NULL pointer dereference in __ieee80211_sta_cap_rx_bw()\nwhen accessing chandef-\u003echan-\u003eband during CSA.\n\nResolve the VLAN sdata to its parent AP sdata using get_bss_sdata()\nbefore accessing link data.\n\n[also change sta-\u003esdata in ARRAY_SIZE even if it doesn't matter]",
  "id": "CVE-2026-31394",
  "modified": "2026-07-27T03:56:25.940357585Z",
  "published": "2026-04-03T15:15:58.806Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31394.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31394"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations"
}