CVE-2018-1000204

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This may lead to copying up to 1000 kernel heap pages to the userspace. This has been fixed upstream in https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 already. The problem has limited scope, as users don't usually have permissions to access SCSI devices. On the other hand, e.g. the Nero user manual suggests doing `chmod o+r+w /dev/sg*` to make the devices accessible. NOTE: third parties dispute the relevance of this report, noting that the requirement for an attacker to have both the CAP_SYS_ADMIN and CAP_SYS_RAWIO capabilities makes it \"virtually impossible to exploit."}, {"lang": "es", "value": "** EN DISPUTA ** El kernel de Linux desde la versi\u00f3n 3.18 hasta la 4.16 manipula incorrectamente una llamada IOCTL SG_IO en /dev/sg0 con dxfer_direction=SG_DXFER_FROM_DEV y un cmdp de 6 bytes vac\u00edo. Esto puede permitir que se copien hasta 1000 p\u00e1ginas de la memoria din\u00e1mica (heap) del kernel al espacio de usuario. Esto ya se ha resuelto en versiones upstream en https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824. El problema tiene un alcance limitado, ya que los usuarios no suelen tener permisos para acceder a los dispositivos SCSI. Por otro lado, por ejemplo, el manual de usuario de Nero sugiere hacer \"chmod o+r+w /dev/sg*\" para que los dispositivos sean accesibles. NOTA: terceros cuestionan la relevancia de este informe, se\u00f1alando que el requisito de que un atacante tenga las capacidades CAP_SYS_ADMIN y CAP_SYS_RAWIO lo hace \"virtualmente imposible de explotar\"."}], "id": "CVE-2018-1000204", "lastModified": "2026-06-17T01:32:40.543", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 6.3, "confidentialityImpact": "COMPLETE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:S/C:C/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 6.8, "impactScore": 6.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, 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{"affected_release": [{"advisory": "RHSA-2018:2948", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-alt-0:4.14.0-115.el7a", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2018-10-30T00:00:00Z"}], "bugzilla": {"description": "kernel: Infoleak caused by incorrect handling of the SG_IO ioctl", "id": "1589324", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1589324"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N", "status": "verified"}, "cwe": "CWE-200", "details": ["Linux Kernel version 3.18 to 4.16 incorrectly handles an SG_IO ioctl on /dev/sg0 with dxfer_direction=SG_DXFER_FROM_DEV and an empty 6-byte cmdp. This may lead to copying up to 1000 kernel heap pages to the userspace. This has been fixed upstream in https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 already. The problem has limited scope, as users don't usually have permissions to access SCSI devices. On the other hand, e.g. the Nero user manual suggests doing `chmod o+r+w /dev/sg*` to make the devices accessible. NOTE: third parties dispute the relevance of this report, noting that the requirement for an attacker to have both the CAP_SYS_ADMIN and CAP_SYS_RAWIO capabilities makes it \"virtually impossible to exploit.", "A malformed SG_IO ioctl issued for a SCSI device in the Linux kernel leads to a local kernel data leak manifesting in up to approximately 1000 memory pages copied to the userspace. The problem has limited scope as non-privileged users usually have no permissions to access SCSI device files."], "name": "CVE-2018-1000204", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"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:/a:redhat:enterprise_mrg:2", "fix_state": "Not affected", "package_name": "realtime-kernel", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2018-05-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-1000204\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-1000204"], "threat_severity": "Low"}

{}