Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-04-06 06:59

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

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/65c25b588994dd422…
	https://git.kernel.org/stable/c/5a86d4e920d9783a1…
	https://git.kernel.org/stable/c/3c6629e859a2211a1…
	https://git.kernel.org/stable/c/672e5229e1ecfc2a3…

Impacted products

Vendor

Product

Version

Linux

Affected: b27512368591fc959768df1f7dacf2a96b1bd036 , < 65c25b588994dd422fea73fa322de56e1ae4a33b (git)
Affected: b27512368591fc959768df1f7dacf2a96b1bd036 , < 5a86d4e920d9783a198e39cf53f0e410fba5fbd6 (git)
Affected: b27512368591fc959768df1f7dacf2a96b1bd036 , < 3c6629e859a2211a1fbb4868f915413f80001ca5 (git)
Affected: b27512368591fc959768df1f7dacf2a96b1bd036 , < 672e5229e1ecfc2a3509b53adcb914d8b024a853 (git)

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-rc5 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/chan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "65c25b588994dd422fea73fa322de56e1ae4a33b",
              "status": "affected",
              "version": "b27512368591fc959768df1f7dacf2a96b1bd036",
              "versionType": "git"
            },
            {
              "lessThan": "5a86d4e920d9783a198e39cf53f0e410fba5fbd6",
              "status": "affected",
              "version": "b27512368591fc959768df1f7dacf2a96b1bd036",
              "versionType": "git"
            },
            {
              "lessThan": "3c6629e859a2211a1fbb4868f915413f80001ca5",
              "status": "affected",
              "version": "b27512368591fc959768df1f7dacf2a96b1bd036",
              "versionType": "git"
            },
            {
              "lessThan": "672e5229e1ecfc2a3509b53adcb914d8b024a853",
              "status": "affected",
              "version": "b27512368591fc959768df1f7dacf2a96b1bd036",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mac80211/chan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.78",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.20",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.10",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0-rc5",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027t matter]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-06T06:59:51.401Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6"
        },
        {
          "url": "https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5"
        },
        {
          "url": "https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853"
        }
      ],
      "title": "mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31394",
    "datePublished": "2026-04-03T15:15:58.806Z",
    "dateReserved": "2026-03-09T15:48:24.085Z",
    "dateUpdated": "2026-04-06T06:59:51.401Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31394\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-03T16:16:37.597\",\"lastModified\":\"2026-04-03T16:16:37.597\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\u0027t matter]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}

FKIE_CVE-2026-31394

Vulnerability from fkie_nvd - Published: 2026-04-03 16:16 - Updated: 2026-04-03 16:16

Severity ?

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027t matter]"
    }
  ],
  "id": "CVE-2026-31394",
  "lastModified": "2026-04-03T16:16:37.597",
  "metrics": {},
  "published": "2026-04-03T16:16:37.597",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-96F2-8M7P-Q7J4

Vulnerability from github – Published: 2026-04-03 18:31 – Updated: 2026-04-03 18:31

Details

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]

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-31394"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-03T16:16:37Z",
    "severity": null
  },
  "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\u0027t matter]",
  "id": "GHSA-96f2-8m7p-q7j4",
  "modified": "2026-04-03T18:31:23Z",
  "published": "2026-04-03T18:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31394"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

MSRC_CVE-2026-31394

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-05 01:02

Summary

mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-31394

References

URL

Sightings

Author	Source	Type	Date

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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.

Detection rules are retrieved from Rulezet.

Action not permitted

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

FKIE_CVE-2026-31394

GHSA-96F2-8M7P-Q7J4

MSRC_CVE-2026-31394

Tags

Sightings

Nomenclature