CVE-2011-1021

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "secalert@redhat.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F67EAF8E-BB91-43DF-ACD8-515FC95B0988", "versionEndIncluding": "2.6.9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.9:rc1:*:*:*:*:*:*", "matchCriteriaId": "FC106BDA-2EA4-41A2-AA01-6352A5C255B5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.9:rc2:*:*:*:*:*:*", "matchCriteriaId": "FB515243-7519-4CA4-9267-D9A6798CBC49", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.9:rc3:*:*:*:*:*:*", "matchCriteriaId": "B672E1B6-E8E9-473F-853F-906EA56D712E", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.9:rc4:*:*:*:*:*:*", "matchCriteriaId": "0EA23C4F-0848-4680-ACB0-CBC57D3F8C5E", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347."}, {"lang": "es", "value": "drivers/acpi/debugfs.c en el kernel de Linux antes de v3.0 permite a usuarios locales modificar posiciones de memoria del kernel de su elecci\u00f3n aprovechandose de los privilegios de root para escribir en el archivo /sys/kernel/debug/acpi/custom_method. NOTA: esta vulnerabilidad existe debido a una soluci\u00f3n incompleta para el CVE-2010-4347."}], "id": "CVE-2011-1021", "lastModified": "2026-06-16T23:28:34.267", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 3.6, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:L/AC:L/Au:N/C:N/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 4.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}]}, "published": "2012-06-21T23:55:01.897", "references": [{"source": "secalert@redhat.com", "url": "http://ftp.osuosl.org/pub/linux/kernel/v3.0/ChangeLog-3.0"}, {"source": "secalert@redhat.com", "url": "http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=526b4af47f44148c9d665e57723ed9f86634c6e3"}, {"source": "secalert@redhat.com", "url": "http://www.openwall.com/lists/oss-security/2011/02/25/5"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=680841"}, {"source": "secalert@redhat.com", "tags": ["Exploit", "Patch"], "url": "https://github.com/torvalds/linux/commit/526b4af47f44148c9d665e57723ed9f86634c6e3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://ftp.osuosl.org/pub/linux/kernel/v3.0/ChangeLog-3.0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=526b4af47f44148c9d665e57723ed9f86634c6e3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2011/02/25/5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=680841"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Patch"], "url": "https://github.com/torvalds/linux/commit/526b4af47f44148c9d665e57723ed9f86634c6e3"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-264"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2011:1253", "cpe": "cpe:/a:redhat:enterprise_mrg:2:server:el6", "package": "kernel-rt-0:2.6.33.9-rt31.75.el6rt", "product_name": "Red Hat Enterprise MRG 2", "release_date": "2011-09-12T00:00:00Z"}], "bugzilla": {"description": "kernel: /sys/kernel/debug/acpi/custom_method can bypass module restrictions", "id": "680841", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=680841"}, "csaw": false, "cvss": {"cvss_base_score": "6.0", "cvss_scoring_vector": "AV:L/AC:H/Au:S/C:C/I:C/A:C", "status": "verified"}, "details": ["drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347."], "name": "CVE-2011-1021", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:4", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 4"}, {"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"}], "public_date": "2011-02-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2011-1021\nhttps://nvd.nist.gov/vuln/detail/CVE-2011-1021"], "statement": "The version of Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, and 6 as they did not include upstream commit a1a541d8 and a25ee920 that introduced the problem. This has been addressed in Red Hat Enterprise MRG via https://rhn.redhat.com/errata/RHSA-2011-1253.html.\nNotes:\nThis requires debugfs to be mounted on a local system in order to have access\nto the custom_method file. Debugfs is not mounted by default. You need to run\n\"mount -t debugfs nodev /sys/kernel/debug\" as root first.", "threat_severity": "Moderate"}

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