CVE-2021-3491

{"id": "CVE-2021-3491", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 7.2, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "LOW", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "acInsufInfo": false, "impactScore": 10.0, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.0}, {"type": "Secondary", "source": "security@ubuntu.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 1.1}]}, "published": "2021-06-04T02:15:07.253", "references": [{"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d1f82808877bb10d3deee7cf3374a4eb3fb582db", "tags": ["Patch", "Vendor Advisory"], "source": "security@ubuntu.com"}, {"url": "https://security.netapp.com/advisory/ntap-20210716-0004/", "tags": ["Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "https://ubuntu.com/security/notices/USN-4949-1", "tags": ["Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "https://ubuntu.com/security/notices/USN-4950-1", "tags": ["Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "https://www.openwall.com/lists/oss-security/2021/05/11/13", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "source": "security@ubuntu.com"}, {"url": "https://www.zerodayinitiative.com/advisories/ZDI-21-589/", "tags": ["Third Party Advisory", "VDB Entry"], "source": "security@ubuntu.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "security@ubuntu.com", "description": [{"lang": "en", "value": "CWE-131"}]}], "descriptions": [{"lang": "en", "value": "The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b (\"io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers\") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c (\"io_uring: add IORING_OP_PROVIDE_BUFFERS\") (v5.7-rc1)."}, {"lang": "es", "value": "El subsistema io_uring del kernel de Linux permit\u00eda saltarse el l\u00edmite MAX_RW_COUNT en la operaci\u00f3n PROVIDE_BUFFERS, lo que llevaba a utilizar valores negativos en mem_rw al leer /proc//mem. Esto pod\u00eda utilizarse para crear un desbordamiento de la pila que conduc\u00eda a la ejecuci\u00f3n de c\u00f3digo arbitrario en el kernel. Se solucion\u00f3 mediante el commit d1f82808877b (\"io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers\") (v5.13-rc1) y se retroaliment\u00f3 a los kernels estables en versiones v5.12.4, v5.11.21 y v5.10.37. Se introdujo en ddf0322db79c (\"io_uring: add IORING_OP_PROVIDE_BUFFERS\") (v5.7-rc1)."}], "lastModified": "2021-09-14T14:31:37.070", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FD815E0C-D654-4F05-B0AE-39939D922E39", "versionEndExcluding": "5.10.37", "versionStartIncluding": "5.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8CBB94EC-EC33-4464-99C5-03E5542715F0", "versionEndExcluding": "5.11.21", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D8C7052F-1B7B-4327-9C2B-84EBF3243838", "versionEndExcluding": "5.12.4", "versionStartIncluding": "5.12"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*", "vulnerable": true, "matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB"}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.10:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "338B3AAC-C147-4A31-95E7-6E8A6FB4B3FC"}, {"criteria": "cpe:2.3:o:canonical:ubuntu_linux:21.04:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8EF1C1CC-3FAE-4DE3-BC41-E5B14D5721F4"}], "operator": "OR"}]}], "sourceIdentifier": "security@ubuntu.com"}