FKIE_CVE-2026-98184

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-06 09:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: prevent authentication frame length truncation mwifiex_cfg80211_authenticate() derives the authentication frame length from req->ie_len and req->auth_data_len, both of type size_t, but stores it in a u16. NL80211_ATTR_AUTH_DATA only has a minimum length policy. Since nla_len is a u16, a single attribute can carry up to 65531 bytes of payload, so the sum can exceed U16_MAX before it is assigned to pkt_len. The truncated pkt_len determines the skb frame area, while the copy length remains req->auth_data_len - 4, resulting in a heap buffer overflow. For example, with auth_data_len equal to 65510 and no IEs, the sum is 65546. It is truncated to 10 and then reduced by four to 6. The driver appends only six bytes to the skb with skb_put(), but then copies 65506 user-provided bytes into the authentication body. Reaching this path requires CAP_NET_ADMIN in the user namespace owning the network namespace, an up station netdev, and a suitable BSS/SAE authentication request. Compute the length in size_t, reject values that cannot be represented by the firmware's u16 frame length field, and only then assign it to pkt_len.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/25c45a2075cc00faed45f92a64bb172fb074a2ee
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5747eaa38a7fcad48be2fd910b65008198b2b06c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/877b61a67d5eb3e616478daf3908114b57feff1e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fa00193eb991f92b007aefe7afb6a7566976dacf
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/marvell/mwifiex/cfg80211.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "25c45a2075cc00faed45f92a64bb172fb074a2ee",
              "status": "affected",
              "version": "36995892c271cce5e2230bc165a06f109b117222",
              "versionType": "git"
            },
            {
              "lessThan": "5747eaa38a7fcad48be2fd910b65008198b2b06c",
              "status": "affected",
              "version": "36995892c271cce5e2230bc165a06f109b117222",
              "versionType": "git"
            },
            {
              "lessThan": "877b61a67d5eb3e616478daf3908114b57feff1e",
              "status": "affected",
              "version": "36995892c271cce5e2230bc165a06f109b117222",
              "versionType": "git"
            },
            {
              "lessThan": "fa00193eb991f92b007aefe7afb6a7566976dacf",
              "status": "affected",
              "version": "36995892c271cce5e2230bc165a06f109b117222",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/marvell/mwifiex/cfg80211.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mwifiex: prevent authentication frame length truncation\n\nmwifiex_cfg80211_authenticate() derives the authentication frame length\nfrom req-\u003eie_len and req-\u003eauth_data_len, both of type size_t, but stores\nit in a u16.\n\nNL80211_ATTR_AUTH_DATA only has a minimum length policy. Since nla_len is\na u16, a single attribute can carry up to 65531 bytes of payload, so the\nsum can exceed U16_MAX before it is assigned to pkt_len. The truncated\npkt_len determines the skb frame area, while the copy length remains\nreq-\u003eauth_data_len - 4, resulting in a heap buffer overflow.\n\nFor example, with auth_data_len equal to 65510 and no IEs, the sum is\n65546. It is truncated to 10 and then reduced by four to 6. The driver\nappends only six bytes to the skb with skb_put(), but then copies 65506\nuser-provided bytes into the authentication body.\n\nReaching this path requires CAP_NET_ADMIN in the user namespace owning\nthe network namespace, an up station netdev, and a suitable BSS/SAE\nauthentication request.\n\nCompute the length in size_t, reject values that cannot be represented by\nthe firmware\u0027s u16 frame length field, and only then assign it to pkt_len."
    }
  ],
  "id": "CVE-2026-98184",
  "lastModified": "2026-10-06T09:18:03.233",
  "metrics": {},
  "published": "2026-10-06T09:18:03.233",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/25c45a2075cc00faed45f92a64bb172fb074a2ee"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5747eaa38a7fcad48be2fd910b65008198b2b06c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/877b61a67d5eb3e616478daf3908114b57feff1e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fa00193eb991f92b007aefe7afb6a7566976dacf"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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