CVE-2024-57934

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The loop checks if an element is a\nfgraph_stub to prevent using a fgraph_stub afterward.\n\nHowever, if the compiler reloads fgraph_array[] after this check, it might\nrace with an update to fgraph_array[] that introduces a fgraph_stub. This\ncould result in the stub being processed, but the stub contains a null\n\"func_hash\" field, leading to a NULL pointer dereference.\n\nTo ensure that the gops compared against the fgraph_stub matches the gops\nprocessed later, add a READ_ONCE(). A similar patch appears in commit\n63a8dfb (\"function_graph: Add READ_ONCE() when accessing fgraph_array[]\")."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fgraph: Agregar READ_ONCE() al acceder a fgraph_array[] En __ftrace_return_to_handler(), un bucle itera sobre los elementos fgraph_array[], que son fgraph_ops. El bucle comprueba si un elemento es un fgraph_stub para evitar usar un fgraph_stub despu\u00e9s. Sin embargo, si el compilador vuelve a cargar fgraph_array[] despu\u00e9s de esta comprobaci\u00f3n, podr\u00eda competir con una actualizaci\u00f3n a fgraph_array[] que introduce un fgraph_stub. Esto podr\u00eda dar como resultado que se procese el stub, pero que este contenga un campo \"func_hash\" nulo, lo que lleva a una desreferencia de puntero NULL. Para garantizar que los gops comparados con fgraph_stub coincidan con los gops procesados ??m\u00e1s tarde, agregue un READ_ONCE(). Un parche similar aparece en el commit 63a8dfb (\"function_graph: Agregar READ_ONCE() al acceder a fgraph_array[]\")."}], "id": "CVE-2024-57934", "lastModified": "2026-06-17T08:14:16.037", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-57934", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T19:52:53.039611Z", "version": "2.0.3"}}]}, "published": "2025-01-21T12:15:27.047", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b68b2a3fbacc7be720ef589d489bcacdd05c6d38"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d65474033740ded0a4fe9a097fce72328655b41d"}], "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: fgraph: Add READ_ONCE() when accessing fgraph_array[]", "id": "2339144", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2339144"}, "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"}, "cwe": "CWE-362->CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfgraph: Add READ_ONCE() when accessing fgraph_array[]\nIn __ftrace_return_to_handler(), a loop iterates over the fgraph_array[]\nelements, which are fgraph_ops. The loop checks if an element is a\nfgraph_stub to prevent using a fgraph_stub afterward.\nHowever, if the compiler reloads fgraph_array[] after this check, it might\nrace with an update to fgraph_array[] that introduces a fgraph_stub. This\ncould result in the stub being processed, but the stub contains a null\n\"func_hash\" field, leading to a NULL pointer dereference.\nTo ensure that the gops compared against the fgraph_stub matches the gops\nprocessed later, add a READ_ONCE(). A similar patch appears in commit\n63a8dfb (\"function_graph: Add READ_ONCE() when accessing fgraph_array[]\").", "A flaw was found in the Kernel Function Graph Tracer module in the Linux kernel. A race condition between checking and updating the fgraph_array can cause a NULL pointer dereference, causing a crash and resulting in a denial of service."], "name": "CVE-2024-57934", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-01-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-57934\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-57934\nhttps://lore.kernel.org/linux-cve-announce/2025012148-CVE-2024-57934-6cd8@gregkh/T"], "statement": "The Kernel Function Graph Tracer module in the Linux kernel as shipped in Red Hat Enterprise Linux 8 and 9 is not affected by this vulnerability because the vulnerable code was introduced in a newer version of the Linux kernel.", "threat_severity": "Moderate"}

{}