CVE-2026-72124

Estado: RecibidaAlta (8.8)—

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

can: isotp: serialize TX state transitions under so->rx_lock

The TX state machine (so->tx.state) is driven from three contexts: sendmsg() claiming and progressing a transfer, the RX path consuming Flow Control/echo frames, and two hrtimers timing out a stalled transfer. Mixing a lock-free cmpxchg() claim in sendmsg() with hrtimer_cancel() calls made under so->rx_lock elsewhere left windows where a frame or timer callback could act on a state that had already moved on, corrupting an unrelated transfer.

so->rx_lock now covers the full lifecycle of a TX claim: sendmsg() takes it to check so->tx.state is ISOTP_IDLE, switch it to ISOTP_SENDING, bump so->tx_gen and drain the previous transfer's timers - all as one critical section. isotp_rcv_fc()/isotp_rcv_cf() already run under this lock via isotp_rcv(), and isotp_rcv_echo() now takes it itself, so none of them can ever observe a transfer mid-claim.

Leer descripción completaMostrar menos

This also means a transfer can no longer be handed to sendmsg()'s cleanup paths (signal or send error) while another thread is concurrently claiming or finishing it, so those paths can cancel timers and reset the state unconditionally.

isotp_release() claims the socket the same way, so a racing sendmsg() sees a consistent ISOTP_SHUTDOWN and skips arming its timer or sending.

Only the hrtimer callbacks stay outside so->rx_lock, since they run under so->rx_lock's cancellation elsewhere and taking it themselves would deadlock. so->tx_gen lets them recognize whether the transfer they timed out is still the one currently active, so they don't report an error against a transfer that has since completed or been superseded.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 8.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.41%
Percentil entre todas las CVEs puntuadas: 33
Fecha de la puntuación: 6/10/2026

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 movement35 %
Impacto principalT1499.004 Application or System Exploitationimpact45 %
Impacto secundarioT1565.001 Stored Data Manipulationimpact40 %

Red adyacente (AV:A) sin privilegios. Race condition en máquina de estados permite corrupción de estado y DoS por transferencias bloqueadas; impacto local de integridad de datos no acreditado explícitamente.

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 Restrict File and Directory Permissions Privileged Account Management Remote Data Storage Network Segmentation

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)

Mostrar

{
  "id": "CVE-2026-72124",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.8,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "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": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
              "lessThan": "bbedeb67a9a684f2fb78c55bd3662c400526715e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
              "lessThan": "377a8f500704da42ed86a4541ed930e9dcfdb2ea",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
              "lessThan": "6da8119e8dd542194103139812d1a4b7dcd1aedd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
              "lessThan": "0b05eca9589f609e2491b528dccf683168a4cda8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
              "lessThan": "a7d90e7b5e75d7406c889fe36e9a61ee364a00cb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
              "lessThan": "37beb16e08cae94cc05840c7274225e3b0b38ae7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
              "lessThan": "4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e057dd3fc20ffb3d7f150af46542a51b59b90127",
              "lessThan": "cf070fe33bfbd1a4c21236078fadb35dd223a157",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/can/isotp.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.10",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/can/isotp.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:21:29.720",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0b05eca9589f609e2491b528dccf683168a4cda8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/377a8f500704da42ed86a4541ed930e9dcfdb2ea",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/37beb16e08cae94cc05840c7274225e3b0b38ae7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4f1fdf1a1c317bcac0c6b6c8e12642c9983de1ca",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6da8119e8dd542194103139812d1a4b7dcd1aedd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a7d90e7b5e75d7406c889fe36e9a61ee364a00cb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bbedeb67a9a684f2fb78c55bd3662c400526715e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cf070fe33bfbd1a4c21236078fadb35dd223a157",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: serialize TX state transitions under so->rx_lock\n\nThe TX state machine (so->tx.state) is driven from three contexts:\nsendmsg() claiming and progressing a transfer, the RX path consuming\nFlow Control/echo frames, and two hrtimers timing out a stalled\ntransfer. Mixing a lock-free cmpxchg() claim in sendmsg() with\nhrtimer_cancel() calls made under so->rx_lock elsewhere left windows\nwhere a frame or timer callback could act on a state that had already\nmoved on, corrupting an unrelated transfer.\n\nso->rx_lock now covers the full lifecycle of a TX claim: sendmsg()\ntakes it to check so->tx.state is ISOTP_IDLE, switch it to\nISOTP_SENDING, bump so->tx_gen and drain the previous transfer's\ntimers - all as one critical section. isotp_rcv_fc()/isotp_rcv_cf()\nalready run under this lock via isotp_rcv(), and isotp_rcv_echo() now\ntakes it itself, so none of them can ever observe a transfer mid-claim.\nThis also means a transfer can no longer be handed to sendmsg()'s\ncleanup paths (signal or send error) while another thread is\nconcurrently claiming or finishing it, so those paths can cancel\ntimers and reset the state unconditionally.\n\nisotp_release() claims the socket the same way, so a racing sendmsg()\nsees a consistent ISOTP_SHUTDOWN and skips arming its timer or sending.\n\nOnly the hrtimer callbacks stay outside so->rx_lock, since they run\nunder so->rx_lock's cancellation elsewhere and taking it themselves\nwould deadlock. so->tx_gen lets them recognize whether the transfer\nthey timed out is still the one currently active, so they don't\nreport an error against a transfer that has since completed or been\nsuperseded."
    }
  ],
  "lastModified": "2026-08-19T17:20:59.847",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}