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CVE-2026-68402

Status: ReceivedHigh (7.1)—

In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: bound element ID read when checking non-inheritance

cfg80211_is_element_inherited() reads the first data octet of the candidate element (id = elem->data[0]) to look it up in an extension non-inheritance list. It does so after testing elem->id, but without verifying that the element actually has a data octet. A zero-length extension element (WLAN_EID_EXTENSION with length 0) therefore makes it read one octet past the end of the element.

_ieee802_11_parse_elems_full() runs this check for every element of a frame once a non-inheritance context exists -- e.g. while parsing a per-STA profile of a Multi-Link element in a (re)association response, or a non-transmitted BSS profile -- so a crafted frame from an AP can trigger a one-octet slab-out-of-bounds read during element parsing:

Read full descriptionShow less

Return early (treat the element as inherited) when an extension element carries no data, mirroring the existing handling of empty ID lists.

The bug was found by fuzzing ieee802_11_parse_elems_full() under KASAN.

Technical details traces, logs and code from the original report
  BUG: KASAN: slab-out-of-bounds in cfg80211_is_element_inherited
  Read of size 1 ... in net/wireless/scan.c

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

AV:A y PR:N indican red adyacente; T1210 por servicios inalámbricos. Impacto: A:H (High) y lectura de memoria fuera de límites sugieren DoS mediante crash o lectura de datos sensibles en kernel.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationFilter Network TrafficDisable or Remove Feature or Program

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux KernelAI

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-68402",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 4.2,
        "exploitabilityScore": 2.8
      }
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  "affected": [
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      "affectedData": [
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          "product": "Linux",
          "versions": [
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              "version": "7.2",
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              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
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          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-10T13:20:33.710",
  "references": [
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      "url": "https://git.kernel.org/stable/c/11ac7a5e75f5132f1778e0c60981d30dc29fb869",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: bound element ID read when checking non-inheritance\n\ncfg80211_is_element_inherited() reads the first data octet of the\ncandidate element (id = elem->data[0]) to look it up in an extension\nnon-inheritance list. It does so after testing elem->id, but without\nverifying that the element actually has a data octet. A zero-length\nextension element (WLAN_EID_EXTENSION with length 0) therefore makes it\nread one octet past the end of the element.\n\n_ieee802_11_parse_elems_full() runs this check for every element of a\nframe once a non-inheritance context exists -- e.g. while parsing a\nper-STA profile of a Multi-Link element in a (re)association response,\nor a non-transmitted BSS profile -- so a crafted frame from an AP can\ntrigger a one-octet slab-out-of-bounds read during element parsing:\n\n  BUG: KASAN: slab-out-of-bounds in cfg80211_is_element_inherited\n  Read of size 1 ... in net/wireless/scan.c\n\nReturn early (treat the element as inherited) when an extension element\ncarries no data, mirroring the existing handling of empty ID lists.\n\nThe bug was found by fuzzing ieee802_11_parse_elems_full() under KASAN."
    }
  ],
  "lastModified": "2026-08-19T17:20:48.030",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}