FKIE_CVE-2026-74666

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: packet: synchronize pressure clearing with ring reconfiguration packet_set_ring() updates the RX ring state under sk_receive_queue.lock, but used to publish the tpacket receive mode through po->prot_hook.func after releasing that lock. packet_poll() and packet_recvmsg() can then run the pressure clearing path after the ring has been cleared while still seeing tpacket_rcv, causing __packet_rcv_has_room() to dereference stale or NULL ring storage. Move the existing receive hook assignment into the same sk_receive_queue.lock section as the ring state update. Keep the assignment otherwise unchanged, including on TX ring reconfiguration, to avoid adding behavior changes that are not required for the fix. Serialize packet_recvmsg() pressure clearing with the same queue lock only after PACKET_SOCK_PRESSURE has been observed. If the flag is clear and the socket has moved away from tpacket_rcv, packet_set_ring() has already detached the socket and waited for synchronize_net(), so no new packet input can set the flag again. packet_poll() already holds sk_receive_queue.lock, so it uses the new unlocked helper directly.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a35da325cac4d5bcad76a2aa943408a6f1d9000
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c7b5eb87b2b288cdbde825f21d2b83b2f5da747
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8cfb2e71926a682f36c4240067d424074dd8f70f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a08196c3cc105947746ec21309edfbb60275fcdb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad740b4990347521f0db260d381f9f74e7b340ba
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf3c8e86bc8ad111be3f3136125e255344bcb3da
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf8189b82bb93f219ab740e0346c919ad65ada62
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f015c9de92b731814059a343b765c60c0196225c
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/packet/af_packet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bf3c8e86bc8ad111be3f3136125e255344bcb3da",
              "status": "affected",
              "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a",
              "versionType": "git"
            },
            {
              "lessThan": "8cfb2e71926a682f36c4240067d424074dd8f70f",
              "status": "affected",
              "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a",
              "versionType": "git"
            },
            {
              "lessThan": "f015c9de92b731814059a343b765c60c0196225c",
              "status": "affected",
              "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a",
              "versionType": "git"
            },
            {
              "lessThan": "cf8189b82bb93f219ab740e0346c919ad65ada62",
              "status": "affected",
              "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a",
              "versionType": "git"
            },
            {
              "lessThan": "ad740b4990347521f0db260d381f9f74e7b340ba",
              "status": "affected",
              "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a",
              "versionType": "git"
            },
            {
              "lessThan": "2c7b5eb87b2b288cdbde825f21d2b83b2f5da747",
              "status": "affected",
              "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a",
              "versionType": "git"
            },
            {
              "lessThan": "a08196c3cc105947746ec21309edfbb60275fcdb",
              "status": "affected",
              "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a",
              "versionType": "git"
            },
            {
              "lessThan": "1a35da325cac4d5bcad76a2aa943408a6f1d9000",
              "status": "affected",
              "version": "2ccdbaa6d55b0656244ba57c4b56765a0af76c0a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/packet/af_packet.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.2"
            },
            {
              "lessThan": "4.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.267",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.218",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.185",
              "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\npacket: synchronize pressure clearing with ring reconfiguration\n\npacket_set_ring() updates the RX ring state under sk_receive_queue.lock,\nbut used to publish the tpacket receive mode through po-\u003eprot_hook.func\nafter releasing that lock. packet_poll() and packet_recvmsg() can then\nrun the pressure clearing path after the ring has been cleared while\nstill seeing tpacket_rcv, causing __packet_rcv_has_room() to dereference\nstale or NULL ring storage.\n\nMove the existing receive hook assignment into the same\nsk_receive_queue.lock section as the ring state update. Keep the\nassignment otherwise unchanged, including on TX ring reconfiguration, to\navoid adding behavior changes that are not required for the fix.\n\nSerialize packet_recvmsg() pressure clearing with the same queue lock\nonly after PACKET_SOCK_PRESSURE has been observed. If the flag is clear\nand the socket has moved away from tpacket_rcv, packet_set_ring() has\nalready detached the socket and waited for synchronize_net(), so no new\npacket input can set the flag again.\n\npacket_poll() already holds sk_receive_queue.lock, so it uses the new\nunlocked helper directly."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\npacket: sincronizar la limpieza de presi\u00f3n con la reconfiguraci\u00f3n del anillo\n\npacket_set_ring() actualiza el estado del anillo RX bajo sk_receive_queue.lock, pero sol\u00eda publicar el modo de recepci\u00f3n tpacket a trav\u00e9s de po -\u003e prot_hook.func despu\u00e9s de liberar ese bloqueo. packet_poll() y packet_recvmsg() pueden entonces ejecutar la ruta de limpieza de presi\u00f3n despu\u00e9s de que el anillo ha sido limpiado mientras a\u00fan ven tpacket_rcv, causando que __packet_rcv_has_room() desreferencie almacenamiento de anillo obsoleto o NULL.\n\nMover la asignaci\u00f3n de gancho de recepci\u00f3n existente a la misma secci\u00f3n sk_receive_queue.lock que la actualizaci\u00f3n del estado del anillo. Mantener la asignaci\u00f3n sin cambios de otra manera, incluyendo en la reconfiguraci\u00f3n del anillo TX, para evitar a\u00f1adir cambios de comportamiento que no son necesarios para la correcci\u00f3n.\n\nSerializar la limpieza de presi\u00f3n de packet_recvmsg() con el mismo bloqueo de cola solo despu\u00e9s de que PACKET_SOCK_PRESSURE ha sido observado. Si el indicador est\u00e1 claro y el socket se ha alejado de tpacket_rcv, packet_set_ring() ya ha desvinculado el socket y esperado por synchronize_net(), por lo que ninguna nueva entrada de paquete puede establecer el indicador de nuevo.\n\npacket_poll() ya mantiene sk_receive_queue.lock, por lo que utiliza el nuevo ayudante desbloqueado directamente."
    }
  ],
  "id": "CVE-2026-74666",
  "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": "2026-08-22T16:16:40.467",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1a35da325cac4d5bcad76a2aa943408a6f1d9000"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2c7b5eb87b2b288cdbde825f21d2b83b2f5da747"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8cfb2e71926a682f36c4240067d424074dd8f70f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a08196c3cc105947746ec21309edfbb60275fcdb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ad740b4990347521f0db260d381f9f74e7b340ba"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bf3c8e86bc8ad111be3f3136125e255344bcb3da"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf8189b82bb93f219ab740e0346c919ad65ada62"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f015c9de92b731814059a343b765c60c0196225c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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