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Para las interfaces dirty_bytes/dirty_background_bytes podemos simplemente negarnos a establecer l\u00edmites tan grandes. Para dirty_ratio / dirty_background_ratio no es tan simple ya que el l\u00edmite sucio se calcula a partir de la cantidad de memoria disponible que puede cambiar debido a la conexi\u00f3n en caliente de la memoria, etc. Entonces, al convertir l\u00edmites sucios de proporciones a n\u00fameros de p\u00e1ginas, simplemente no permitimos el el resultado excede UINT_MAX. Este es un problema que se puede activar solo desde la ra\u00edz y que ocurre cuando el operador establece l\u00edmites sucios en >16 TB."}], "id": "CVE-2024-42131", "lastModified": "2024-09-16T13:52:37.707", "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": "2024-07-30T08:15:05.130", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2b2d2b8766db028bd827af34075f221ae9e9efff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/385d838df280eba6c8680f9777bfa0d0bfe7e8b2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4d3817b64eda07491bdd86a234629fe0764fb42a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7a49389771ae7666f4dc3426e2a4594bf23ae290"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8e0b5e7f2895eccef5c2a0018b589266f90c4805"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a25e8536184516b55ef89ab91dd2eea429de28d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bd16a7ee339aef3ee4c90cb23902afb6af379ea0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c83ed422c24f0d4b264f89291d4fabe285f80dbc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:6567", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.35.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-09-11T00:00:00Z"}, {"advisory": "RHSA-2024:6567", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.35.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-09-11T00:00:00Z"}, {"advisory": "RHSA-2024:6267", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.82.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-09-04T00:00:00Z"}, {"advisory": "RHSA-2024:6268", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.82.1.rt14.367.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-09-04T00:00:00Z"}], "bugzilla": {"description": "kernel: mm: avoid overflows in dirty throttling logic", "id": "2301496", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2301496"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H", "status": "verified"}, "cwe": "CWE-190", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm: avoid overflows in dirty throttling logic\nThe dirty throttling logic is interspersed with assumptions that dirty\nlimits in PAGE_SIZE units fit into 32-bit (so that various multiplications\nfit into 64-bits). If limits end up being larger, we will hit overflows,\npossible divisions by 0 etc. Fix these problems by never allowing so\nlarge dirty limits as they have dubious practical value anyway. For\ndirty_bytes / dirty_background_bytes interfaces we can just refuse to set\nso large limits. For dirty_ratio / dirty_background_ratio it isn't so\nsimple as the dirty limit is computed from the amount of available memory\nwhich can change due to memory hotplug etc. So when converting dirty\nlimits from ratios to numbers of pages, we just don't allow the result to\nexceed UINT_MAX.\nThis is root-only triggerable problem which occurs when the operator\nsets dirty limits to >16 TB."], "name": "CVE-2024-42131", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-42131\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-42131\nhttps://lore.kernel.org/linux-cve-announce/2024073027-CVE-2024-42131-2f7f@gregkh/T"], "threat_severity": "Moderate", "upstream_fix": "kernel 5.10.222, kernel 5.15.163, kernel 6.1.98, kernel 6.6.39, kernel 6.9.9, kernel 6.10"}