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CVE-2023-53419

Estado: ModificadaMedia (5.5)—

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

rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access

For kernels built with CONFIG_PREEMPT_RCU=y, the following scenario can result in a NULL-pointer dereference:

The problem is that CPU2 accesses the rcu_node structure's->exp_tasks field without holding the rcu_node structure's ->lock and CPU2 did not observe CPU1's change to rcu_node structure's ->exp_tasks in time. Therefore, if CPU1 sets rcu_node structure's->exp_tasks pointer to NULL, then CPU2 might dereference that NULL pointer.

This commit therefore holds the rcu_node structure's ->lock while accessing that structure's->exp_tasks field.

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[ paulmck: Apply Frederic Weisbecker feedback. ]

Detalles técnicos trazas, registros y código del informe original
           CPU1                                           CPU2
rcu_preempt_deferred_qs_irqrestore                rcu_print_task_exp_stall
  if (special.b.blocked)                            READ_ONCE(rnp->exp_tasks) != NULL
    raw_spin_lock_rcu_node
    np = rcu_next_node_entry(t, rnp)
    if (&t->rcu_node_entry == rnp->exp_tasks)
      WRITE_ONCE(rnp->exp_tasks, np)
      ....
      raw_spin_unlock_irqrestore_rcu_node
                                                    raw_spin_lock_irqsave_rcu_node
                                                    t = list_entry(rnp->exp_tasks->prev,
                                                        struct task_struct, rcu_node_entry)
                                                    (if rnp->exp_tasks is NULL, this
                                                       will dereference a NULL pointer)

CVSS

Probabilidad de explotación (EPSS)

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2023-53419",
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  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-01-14T19:11:37.571782Z"
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "exploitabilityScore": 1.8
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrcu: Protect rcu_print_task_exp_stall() ->exp_tasks access\n\nFor kernels built with CONFIG_PREEMPT_RCU=y, the following scenario can\nresult in a NULL-pointer dereference:\n\n           CPU1                                           CPU2\nrcu_preempt_deferred_qs_irqrestore                rcu_print_task_exp_stall\n  if (special.b.blocked)                            READ_ONCE(rnp->exp_tasks) != NULL\n    raw_spin_lock_rcu_node\n    np = rcu_next_node_entry(t, rnp)\n    if (&t->rcu_node_entry == rnp->exp_tasks)\n      WRITE_ONCE(rnp->exp_tasks, np)\n      ....\n      raw_spin_unlock_irqrestore_rcu_node\n                                                    raw_spin_lock_irqsave_rcu_node\n                                                    t = list_entry(rnp->exp_tasks->prev,\n                                                        struct task_struct, rcu_node_entry)\n                                                    (if rnp->exp_tasks is NULL, this\n                                                       will dereference a NULL pointer)\n\nThe problem is that CPU2 accesses the rcu_node structure's->exp_tasks\nfield without holding the rcu_node structure's ->lock and CPU2 did\nnot observe CPU1's change to rcu_node structure's ->exp_tasks in time.\nTherefore, if CPU1 sets rcu_node structure's->exp_tasks pointer to NULL,\nthen CPU2 might dereference that NULL pointer.\n\nThis commit therefore holds the rcu_node structure's ->lock while\naccessing that structure's->exp_tasks field.\n\n[ paulmck: Apply Frederic Weisbecker feedback. ]"
    }
  ],
  "lastModified": "2026-06-17T06:45:16.690",
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