CVE-2023-53419 (GCVE-0-2023-53419)

Vulnerability from cvelistv5 – Published: 2025-09-18 16:04 – Updated: 2026-01-14 19:13
VLAI?
Title
rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access
Summary
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: 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) 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. [ paulmck: Apply Frederic Weisbecker feedback. ]
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 314eeb43e5f22856b281c91c966e51e5782a3498 , < a7d21b8585894e6fff973f6ddae42f02b13f600f (git)
Affected: 314eeb43e5f22856b281c91c966e51e5782a3498 , < e30a55e98ae6c44253d8b129efefd5da5bc6e3bc (git)
Affected: 314eeb43e5f22856b281c91c966e51e5782a3498 , < d0a8c0e31a09ec1efd53079083e2a677956b4d91 (git)
Affected: 314eeb43e5f22856b281c91c966e51e5782a3498 , < 2bc0ae94ef1f9ed322d8ee439de3239ea3632ab2 (git)
Affected: 314eeb43e5f22856b281c91c966e51e5782a3498 , < 3c1566bca3f8349f12b75d0a2d5e4a20ad6262ec (git)
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    Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.181 , ≤ 5.10.* (semver)
Unaffected: 5.15.113 , ≤ 5.15.* (semver)
Unaffected: 6.1.30 , ≤ 6.1.* (semver)
Unaffected: 6.3.4 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
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\"unaffected\", \"version\": \"6.3.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.3.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/rcu/tree_exp.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a7d21b8585894e6fff973f6ddae42f02b13f600f\"}, {\"url\": \"https://git.kernel.org/stable/c/e30a55e98ae6c44253d8b129efefd5da5bc6e3bc\"}, {\"url\": \"https://git.kernel.org/stable/c/d0a8c0e31a09ec1efd53079083e2a677956b4d91\"}, {\"url\": \"https://git.kernel.org/stable/c/2bc0ae94ef1f9ed322d8ee439de3239ea3632ab2\"}, {\"url\": \"https://git.kernel.org/stable/c/3c1566bca3f8349f12b75d0a2d5e4a20ad6262ec\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nrcu: Protect rcu_print_task_exp_stall() -\u003eexp_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-\u003eexp_tasks) != NULL\\n    raw_spin_lock_rcu_node\\n    np = rcu_next_node_entry(t, rnp)\\n    if (\u0026t-\u003ercu_node_entry == rnp-\u003eexp_tasks)\\n      WRITE_ONCE(rnp-\u003eexp_tasks, np)\\n      ....\\n      raw_spin_unlock_irqrestore_rcu_node\\n                                                    raw_spin_lock_irqsave_rcu_node\\n                                                    t = list_entry(rnp-\u003eexp_tasks-\u003eprev,\\n                                                        struct task_struct, rcu_node_entry)\\n                                                    (if rnp-\u003eexp_tasks is NULL, this\\n                                                       will dereference a NULL pointer)\\n\\nThe problem is that CPU2 accesses the rcu_node structure\u0027s-\u003eexp_tasks\\nfield without holding the rcu_node structure\u0027s -\u003elock and CPU2 did\\nnot observe CPU1\u0027s change to rcu_node structure\u0027s -\u003eexp_tasks in time.\\nTherefore, if CPU1 sets rcu_node structure\u0027s-\u003eexp_tasks pointer to NULL,\\nthen CPU2 might dereference that NULL pointer.\\n\\nThis commit therefore holds the rcu_node structure\u0027s -\u003elock while\\naccessing that structure\u0027s-\u003eexp_tasks field.\\n\\n[ paulmck: Apply Frederic Weisbecker feedback. ]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.181\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.113\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.30\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.3.4\", \"versionStartIncluding\": \"5.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4\", \"versionStartIncluding\": \"5.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:20:10.222Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53419\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-14T19:13:10.365Z\", \"dateReserved\": \"2025-09-17T14:54:09.741Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-18T16:04:02.955Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.