CVE-2026-97595

Estado: RecibidaAlta (7.5)—

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

mac802154: fix use-after-free of sdata via queued RX frames

The RX softirq producer ieee802154_subif_frame() queues received beacon and MAC-command frames onto local->rx_beacon_list / rx_mac_cmd_list and schedules a process-context worker, storing a raw mac_pkt->sdata (and skb->dev == sdata->dev) with neither a reference nor any locking:

Reproduced under KASAN by flooding a victim interface with MAC command frames and removing it (the beacon path is the same class via skb->dev):

Fix both lists together:

An in-flight worker that already dequeued a frame keeps its own netdev reference; unregister_netdevice() then waits it out in netdev_run_todo(), which runs at rtnl_unlock() (rtnl released) and after the interface has been closed, so it does not pin rtnl.

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A worker blocked in an association TX only delays that one interface's unregister (the usual "waiting for %s to become free"), it does not hold rtnl. netdev_hold() is used for this reason instead of a cancel_work_sync() under rtnl, which would block on the worker's unbounded MLME TX wait via ieee802154_sync_queue().

The mac-command worker additionally skips processing for a stopped interface (ieee802154_sdata_running()), avoiding a needless association response during teardown.

Detalles técnicos trazas, registros y código del informe original

 - the lists have no lock: the softirq producer list_add_tail()s while the
   mac_wq worker list_del()s, so sibling interfaces on the same phy corrupt
   the list;

 - the workers dereference the interface after it may have been freed.
   mac802154_rx_mac_cmd_worker() touches mac_pkt->sdata directly, and
   mac802154_rx_beacon_worker() -> mac802154_process_beacon() dereferences
   skb->dev (== sdata->dev). Removing an interface frees its sdata
   (netdev_priv) while a queued frame still points at it, so a later worker
   run is a use-after-free.

  BUG: KASAN: slab-use-after-free in mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154]
  Read of size 4 at addr ffff888002f9ea18 by task kworker/u8:1/31
  Workqueue: phy0-mac-cmds mac802154_rx_mac_cmd_worker [mac802154]
  Call Trace:
   mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154]
   process_one_work+0x611/0xe80
   worker_thread+0x52e/0xdc0
   kthread+0x30c/0x630
   ret_from_fork+0x2fd/0x3e0

 - add local->rx_lock and take it around every list access: the softirq
   producer (plain spin_lock, softirq context) and the workers and flush
   (spin_lock_bh, process context);

 - pin the interface for the lifetime of a queued frame with
   netdev_hold()/netdev_put(), so the worker can safely dereference sdata /
   skb->dev even while the interface is being removed;

 - dequeue under the lock at the head and loop-drain the whole list in the
   workers (they previously processed one frame per run and relied on a
   later enqueue to drain the rest);

 - drop not-yet-started frames of an interface before it is unregistered,
   from ieee802154_if_remove() (after the RCU grace period) and from the
   ieee802154_remove_interfaces() loop -- the latter is the whole-phy
   teardown path, which does not go through ieee802154_if_remove().

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.28%
Percentil entre todas las CVEs puntuadas: 19
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement75 %
Impacto principalT1499.004 Application or System Exploitationimpact70 %
Impacto secundarioT1546.016 Installer Packagesprivilege escalation · persistence60 %

Explotación corregida por reglas (vector CVSS): era T1068

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability Scanning Threat Intelligence Program Privileged Account Management Network Segmentation Filter Network Traffic Disable or Remove Feature or Program

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-97595",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.6
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "lessThan": "4826fd8373f684f9952536333ad45b26acd3455d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "lessThan": "4740ef0518c5e3bf31ebfb2288a6ac3b462ead06",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "lessThan": "07f0214018d7241e3610c1be984c8abfce16c099",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "lessThan": "3d1fde35f95d7f02a7dc473c51d81e8d9e992cfc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "57588c71177f0bfc08509c2c3a9bfe32850c0786",
              "lessThan": "2f37fba846c9fdff5fc15b6d93656057ccd13031",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "include/net/cfg802154.h",
            "net/mac802154/ieee802154_i.h",
            "net/mac802154/iface.c",
            "net/mac802154/main.c",
            "net/mac802154/rx.c",
            "net/mac802154/scan.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.3"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.3",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "include/net/cfg802154.h",
            "net/mac802154/ieee802154_i.h",
            "net/mac802154/iface.c",
            "net/mac802154/main.c",
            "net/mac802154/rx.c",
            "net/mac802154/scan.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:10.770",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/07f0214018d7241e3610c1be984c8abfce16c099",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2f37fba846c9fdff5fc15b6d93656057ccd13031",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3d1fde35f95d7f02a7dc473c51d81e8d9e992cfc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4740ef0518c5e3bf31ebfb2288a6ac3b462ead06",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4826fd8373f684f9952536333ad45b26acd3455d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: fix use-after-free of sdata via queued RX frames\n\nThe RX softirq producer ieee802154_subif_frame() queues received beacon\nand MAC-command frames onto local->rx_beacon_list / rx_mac_cmd_list and\nschedules a process-context worker, storing a raw mac_pkt->sdata (and\nskb->dev == sdata->dev) with neither a reference nor any locking:\n\n - the lists have no lock: the softirq producer list_add_tail()s while the\n   mac_wq worker list_del()s, so sibling interfaces on the same phy corrupt\n   the list;\n\n - the workers dereference the interface after it may have been freed.\n   mac802154_rx_mac_cmd_worker() touches mac_pkt->sdata directly, and\n   mac802154_rx_beacon_worker() -> mac802154_process_beacon() dereferences\n   skb->dev (== sdata->dev). Removing an interface frees its sdata\n   (netdev_priv) while a queued frame still points at it, so a later worker\n   run is a use-after-free.\n\nReproduced under KASAN by flooding a victim interface with MAC command\nframes and removing it (the beacon path is the same class via skb->dev):\n\n  BUG: KASAN: slab-use-after-free in mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154]\n  Read of size 4 at addr ffff888002f9ea18 by task kworker/u8:1/31\n  Workqueue: phy0-mac-cmds mac802154_rx_mac_cmd_worker [mac802154]\n  Call Trace:\n   mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154]\n   process_one_work+0x611/0xe80\n   worker_thread+0x52e/0xdc0\n   kthread+0x30c/0x630\n   ret_from_fork+0x2fd/0x3e0\n\nFix both lists together:\n\n - add local->rx_lock and take it around every list access: the softirq\n   producer (plain spin_lock, softirq context) and the workers and flush\n   (spin_lock_bh, process context);\n\n - pin the interface for the lifetime of a queued frame with\n   netdev_hold()/netdev_put(), so the worker can safely dereference sdata /\n   skb->dev even while the interface is being removed;\n\n - dequeue under the lock at the head and loop-drain the whole list in the\n   workers (they previously processed one frame per run and relied on a\n   later enqueue to drain the rest);\n\n - drop not-yet-started frames of an interface before it is unregistered,\n   from ieee802154_if_remove() (after the RCU grace period) and from the\n   ieee802154_remove_interfaces() loop -- the latter is the whole-phy\n   teardown path, which does not go through ieee802154_if_remove().\n\nAn in-flight worker that already dequeued a frame keeps its own netdev\nreference; unregister_netdevice() then waits it out in netdev_run_todo(),\nwhich runs at rtnl_unlock() (rtnl released) and after the interface has\nbeen closed, so it does not pin rtnl. A worker blocked in an association\nTX only delays that one interface's unregister (the usual \"waiting for %s\nto become free\"), it does not hold rtnl. netdev_hold() is used for this\nreason instead of a cancel_work_sync() under rtnl, which would block on\nthe worker's unbounded MLME TX wait via ieee802154_sync_queue().\n\nThe mac-command worker additionally skips processing for a stopped\ninterface (ieee802154_sdata_running()), avoiding a needless association\nresponse during teardown."
    }
  ],
  "lastModified": "2026-10-03T11:18:05.953",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}