CVE-2023-53419

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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. ]"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/rcu/tree_exp.h"], "versions": 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"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() ->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. ]"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.181", "versionStartIncluding": "5.8"}, {"criteria": 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"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "545BD437-3D5F-4281-A7A2-3C6C92933A6B", "versionEndExcluding": "5.10.181", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F3D5E1B5-AB9D-4ECC-8F11-F3E1BF761E27", "versionEndExcluding": "5.15.113", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E9430E62-03EA-42E6-9E5E-BD1D5124D107", "versionEndExcluding": "6.1.30", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "26C54BF0-3EED-46D4-92A7-5F07F658B49B", "versionEndExcluding": "6.3.4", "versionStartIncluding": "6.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"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. ]"}], "id": "CVE-2023-53419", "lastModified": "2026-06-17T06:45:16.690", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-53419", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-14T19:11:37.571782Z", "version": "2.0.3"}}]}, "published": "2025-09-18T16:15:45.650", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2bc0ae94ef1f9ed322d8ee439de3239ea3632ab2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c1566bca3f8349f12b75d0a2d5e4a20ad6262ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a7d21b8585894e6fff973f6ddae42f02b13f600f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d0a8c0e31a09ec1efd53079083e2a677956b4d91"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e30a55e98ae6c44253d8b129efefd5da5bc6e3bc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-476"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access", "id": "2396493", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2396493"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53419", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53419\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53419\nhttps://lore.kernel.org/linux-cve-announce/2025091855-CVE-2023-53419-8597@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-09-19T09:35:35.180705+00:00", "updated": "2025-09-19T09:35:35.180766+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}