FKIE_CVE-2026-74661

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mac802154: fix netdev use-after-free in beacon worker mac802154_beacon_worker() reads local->beacon_req under RCU and derives the sub-interface from the request, but then drops the RCU read lock and continues to use both sdata and the embedded wpan_dev. mac802154_stop_beacons_locked() cancels only pending beacon work, clears local->beacon_req and frees the request. A beacon worker that is already running can therefore continue after interface teardown and dereference the freed netdev private area. The scan worker already pins the netdev before leaving RCU. Apply the same lifetime rule to the beacon worker: take a netdev reference while the request is still protected by RCU, and release it on all paths that continue after the reference is acquired.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mac802154/scan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "e5fb0e03bc7f45508c182a427357bf6b389a9033",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "e6cd416a899edc912b428c4ba399bd73f516cb31",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "9d067e581597c462c51fee8a30b51bc48a68c4e1",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            },
            {
              "lessThan": "5f26a690e8efa54315e4922368daf54e0b8f5515",
              "status": "affected",
              "version": "3accf4762734a69ebd03cba989249c78ac7dfc7e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mac802154/scan.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "lessThan": "6.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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\nmac802154: fix netdev use-after-free in beacon worker\n\nmac802154_beacon_worker() reads local-\u003ebeacon_req under RCU and derives\nthe sub-interface from the request, but then drops the RCU read lock and\ncontinues to use both sdata and the embedded wpan_dev.\n\nmac802154_stop_beacons_locked() cancels only pending beacon work, clears\nlocal-\u003ebeacon_req and frees the request.  A beacon worker that is already\nrunning can therefore continue after interface teardown and dereference\nthe freed netdev private area.\n\nThe scan worker already pins the netdev before leaving RCU.  Apply the\nsame lifetime rule to the beacon worker: take a netdev reference while\nthe request is still protected by RCU, and release it on all paths that\ncontinue after the reference is acquired."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmac802154: corregir uso despu\u00e9s de liberaci\u00f3n de netdev en el trabajador de balizas\n\nmac802154_beacon_worker() lee local -\u003e beacon_req bajo RCU y deriva la subinterfaz de la solicitud, pero luego suelta el bloqueo de lectura RCU y contin\u00faa usando tanto sdata como el wpan_dev incrustado.\n\nmac802154_stop_beacons_locked() cancela solo el trabajo de balizas pendiente, borra local -\u003e beacon_req y libera la solicitud. Un trabajador de balizas que ya est\u00e1 en ejecuci\u00f3n puede, por lo tanto, continuar despu\u00e9s del desmontaje de la interfaz y desreferenciar el \u00e1rea privada de netdev liberada.\n\nEl trabajador de escaneo ya fija el netdev antes de salir de RCU. Aplicar la misma regla de vida \u00fatil al trabajador de balizas: tomar una referencia de netdev mientras la solicitud a\u00fan est\u00e1 protegida por RCU, y liberarla en todas las rutas que contin\u00faan despu\u00e9s de que se adquiere la referencia."
    }
  ],
  "id": "CVE-2026-74661",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:39.883",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5f26a690e8efa54315e4922368daf54e0b8f5515"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9d067e581597c462c51fee8a30b51bc48a68c4e1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e5fb0e03bc7f45508c182a427357bf6b389a9033"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e6cd416a899edc912b428c4ba399bd73f516cb31"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fe820dcc1d8ff77783a9d2bcc93b98c99ac6d517"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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