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But because -EINVAL was returned, the ftrace_bug() tried to report\nwhat was at the location of the ip address, and read it directly. This\ncaused the machine to panic, as the ip was not pointing to a valid memory\naddress.\n\nInstead, read the ip address with copy_from_kernel_nofault() to safely\naccess the memory, and if it faults, report that the address faulted,\notherwise report what was in that location."}, {"lang": "es", "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ftrace: no lea ciegamente la direcci\u00f3n IP en ftrace_bug(). Se inform\u00f3 que un error en arm64 provoc\u00f3 que se usara una direcci\u00f3n IP incorrecta para actualizar a un nop en ftrace_init() , pero la ruta de error (con raz\u00f3n) devolvi\u00f3 -EINVAL y no -EFAULT, ya que el error provoc\u00f3 que ocurriera m\u00e1s de un error. Pero debido a que se devolvi\u00f3 -EINVAL, ftrace_bug() intent\u00f3 informar qu\u00e9 hab\u00eda en la ubicaci\u00f3n de la direcci\u00f3n IP y leerlo directamente. Esto provoc\u00f3 que la m\u00e1quina entrara en p\u00e1nico, ya que la IP no apuntaba a una direcci\u00f3n de memoria v\u00e1lida. En su lugar, lea la direcci\u00f3n IP con copy_from_kernel_nofault() para acceder de forma segura a la memoria y, si falla, informe que la direcci\u00f3n fall\u00f3; de lo contrario, informe qu\u00e9 hab\u00eda en esa ubicaci\u00f3n."}], "id": "CVE-2021-47276", "lastModified": "2025-04-30T14:46:07.833", "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"}]}, "published": "2024-05-21T15:15:15.983", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-706"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ftrace: Do not blindly read the ip address in ftrace_bug()", "id": "2282523", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282523"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nftrace: Do not blindly read the ip address in ftrace_bug()\nIt was reported that a bug on arm64 caused a bad ip address to be used for\nupdating into a nop in ftrace_init(), but the error path (rightfully)\nreturned -EINVAL and not -EFAULT, as the bug caused more than one error to\noccur. But because -EINVAL was returned, the ftrace_bug() tried to report\nwhat was at the location of the ip address, and read it directly. This\ncaused the machine to panic, as the ip was not pointing to a valid memory\naddress.\nInstead, read the ip address with copy_from_kernel_nofault() to safely\naccess the memory, and if it faults, report that the address faulted,\notherwise report what was in that location."], "name": "CVE-2021-47276", "package_state": [{"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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47276\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47276\nhttps://lore.kernel.org/linux-cve-announce/2024052152-CVE-2021-47276-7574@gregkh/T"], "threat_severity": "Low"}