CVE-2026-72003 (GCVE-0-2026-72003)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-10-19 21:09
VLAI
Title
wifi: brcmfmac: cyw: fix heap overflow on a short auth frame
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: cyw: fix heap overflow on a short auth frame brcmf_notify_auth_frame_rx() takes the frame length from the firmware event and copies the frame body with the management header offset subtracted: u32 mgmt_frame_len = e->datalen - sizeof(struct brcmf_rx_mgmt_data); ... memcpy(&mgmt_frame->u, frame, mgmt_frame_len - offsetof(struct ieee80211_mgmt, u)); The only length check is e->datalen >= sizeof(*rxframe), so mgmt_frame_len can be anything from 0 up. offsetof(struct ieee80211_mgmt, u) is 24. When mgmt_frame_len is below that, the subtraction wraps as an unsigned value to a huge length. The memcpy then runs far past the kzalloc'd buffer. A malicious or malfunctioning AP can make the frame short during the external SAE auth exchange, so this is a remotely triggered heap overflow. Reject frames shorter than the management header offset before the copy.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:49 UTC
CWE
  • CWE-191 - Integer Underflow (Wrap or Wraparound)
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 66f909308a7c05082919ff214a0bbe2a76aa0283 , < 55b26abb1fa1ec406b3ad11b43c49c7624257565 (git)
Affected: 66f909308a7c05082919ff214a0bbe2a76aa0283 , < 185bb156c427d0f865d344a6d0eaa02c6d05cc57 (git)
Affected: 66f909308a7c05082919ff214a0bbe2a76aa0283 , < 240c8d2c717b3f8153e7e877b22a82518d78dbdc (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:A - A malicious or rogue AP on the same WiFi/BSS segment sends a truncated 802.11 authentication frame during the external SAE handshake; the brcmfmac CYW driver processes it from firmware events with no other network hop required.\nAC:L - The attacker fully controls the AP and can reliably deliver auth frames with firmware-reported lengths below 24 bytes during SAE, triggering the unsigned underflow and huge memcpy without races or victim-specific heap layout.\nPR:N - Exploitation requires no privileges on the victim host; an unauthenticated adjacent wireless attacker operating a rogue WPA3-SAE AP can trigger the pre-authentication code path without local access or capabilities.\nUI:N - No victim action is required at exploit time beyond normal station behavior; auto-reconnect or background association to a saved WPA3 network (or an evil-twin SSID) suffices to enter external SAE where the malicious auth frame is delivered.\nS:U - Impact is confined to kernel memory on the vulnerable station; successful exploitation yields local privilege escalation or denial of service on the same host, not a cross-VM or cross-security-authority boundary escape.\nC:H - The underflowed memcpy length reads far beyond the firmware event buffer (kernel heap OOB read) and corrupts adjacent heap objects; such heap overflows are routinely weaponized for arbitrary kernel memory disclosure.\nI:H - The same memcpy writes gigabyte-scale data past the kzalloc allocation, corrupting kernel heap metadata and adjacent objects in ways that enable arbitrary write primitives and potential code execution.\nA:H - Copying ~4 GiB from kernel memory reliably causes kernel oops, panic, or hang on the affected system; even failed exploitation typically crashes the host."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-17T05:39:21.650Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/55b26abb1fa1ec406b3ad11b43c49c7624257565"
            },
            {
              "url": "https://git.kernel.org/stable/c/185bb156c427d0f865d344a6d0eaa02c6d05cc57"
            },
            {
              "url": "https://git.kernel.org/stable/c/240c8d2c717b3f8153e7e877b22a82518d78dbdc"
            }
          ],
          "title": "wifi: brcmfmac: cyw: fix heap overflow on a short auth frame",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-72003",
        "datePublished": "2026-08-15T05:51:34.730Z",
        "dateReserved": "2026-08-09T03:40:39.898Z",
        "dateUpdated": "2026-10-19T21:09:12.330Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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