CVE-2025-38071

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Al menos con CONFIG_PHYSICAL_START=0x100000, si hay &lt; 4 MiB de memoria libre contigua disponible en este punto, el kernel se bloquear\u00e1 porque memblock_phys_alloc_range() devuelve 0 en caso de fallo, lo que provoca que memblock_phys_free() descarte los primeros 4 MiB de memoria f\u00edsica. Como m\u00ednimo, deber\u00eda fallar correctamente con un diagn\u00f3stico significativo, pero de hecho todo parece funcionar correctamente sin la extra\u00f1a asignaci\u00f3n de reserva."}], "id": "CVE-2025-38071", "lastModified": "2026-11-05T21:18:08.853", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38071", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T20:49:10.294985Z", "version": "2.0.3"}}]}, "published": "2025-06-18T10:15:40.450", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/631ca8909fd5c62b9fda9edda93924311a78a9c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8c18c904d301ffeb33b071eadc55cd6131e1e9be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bffd5f2815c5234d609725cd0dc2f4bc5de2fc67"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c6f2694c580c27dca0cf7546ee9b4bfa6b940e38"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dde4800d2b0f68b945fd81d4fc2d4a10ae25f743"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: x86/mm: Check return value from memblock_phys_alloc_range()", "id": "2373332", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373332"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nx86/mm: Check return value from memblock_phys_alloc_range()\nAt least with CONFIG_PHYSICAL_START=0x100000, if there is < 4 MiB of\ncontiguous free memory available at this point, the kernel will crash\nand burn because memblock_phys_alloc_range() returns 0 on failure,\nwhich leads memblock_phys_free() to throw the first 4 MiB of physical\nmemory to the wolves.\nAt a minimum it should fail gracefully with a meaningful diagnostic,\nbut in fact everything seems to work fine without the weird reserve\nallocation."], "name": "CVE-2025-38071", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "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", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38071\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38071\nhttps://lore.kernel.org/linux-cve-announce/2025061838-CVE-2025-38071-cc7c@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T09:16:29.580944+00:00", "updated": "2025-06-23T09:16:29.580996+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}