Vulnerability-Lookup

FKIE_CVE-2026-31394

Vulnerability from fkie_nvd - Published: 2026-04-03 16:16 - Updated: 2026-05-20 15:08

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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]

References

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

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "77CDBE06-9D74-42B8-997B-232CD9BBDC24",
              "versionEndExcluding": "6.12.78",
              "versionStartIncluding": "6.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E5571059-6552-48E7-9BEF-3E358C387171",
              "versionEndExcluding": "6.18.20",
              "versionStartIncluding": "6.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "96D34333-38BE-4414-9E79-6EB764329581",
              "versionEndExcluding": "6.19.10",
              "versionStartIncluding": "6.19",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*",
              "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "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": "2026-05-20T15:08:26.533",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-04-03T16:16:37.597",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3c6629e859a2211a1fbb4868f915413f80001ca5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5a86d4e920d9783a198e39cf53f0e410fba5fbd6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/65c25b588994dd422fea73fa322de56e1ae4a33b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/672e5229e1ecfc2a3509b53adcb914d8b024a853"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-05-11 22:07

Title

mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations

Summary

Severity

No CVSS data available.

Assigner

Linux

References

4 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

2 products

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

Show details on NVD website

JSON

To clipboard

{
  "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",
              "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",
                  "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": "2026-05-11T22:07:51.015Z",
        "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": "2026-05-11T22:07:51.015Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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

FKIE_CVE-2026-31394

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

Tags

Sightings

Nomenclature