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Hasta ahora, todas las CPU x86 que admiten MTRR tienen este bit independiente configurado, por lo que pas\u00f3 desapercibido que mtrr_save_state() no comprueba el bit de capacidad antes de acceder a los MSR MTRR fijos. Aunque en una CPU que no admite la capacidad MTRR fija, esto da como resultado un #GP. El #GP en s\u00ed es inofensivo porque el error RDMSR se maneja con elegancia, pero da como resultado un WARN_ON(). 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{"bugzilla": {"description": "kernel: x86/mtrr: Check if fixed MTRRs exist before saving them", "id": "2309779", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2309779"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-754", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nx86/mtrr: Check if fixed MTRRs exist before saving them\nMTRRs have an obsolete fixed variant for fine grained caching control\nof the 640K-1MB region that uses separate MSRs. This fixed variant has\na separate capability bit in the MTRR capability MSR.\nSo far all x86 CPUs which support MTRR have this separate bit set, so it\nwent unnoticed that mtrr_save_state() does not check the capability bit\nbefore accessing the fixed MTRR MSRs.\nThough on a CPU that does not support the fixed MTRR capability this\nresults in a #GP. The #GP itself is harmless because the RDMSR fault is\nhandled gracefully, but results in a WARN_ON().\nAdd the missing capability check to prevent this."], "name": "CVE-2024-44948", "package_state": [{"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:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-44948\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-44948\nhttps://lore.kernel.org/linux-cve-announce/2024090407-CVE-2024-44948-5554@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:31:33.373349+00:00", "updated": "2025-07-12T22:31:33.373404+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}