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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9BF3F4F2-5281-41EC-9471-4C35FCDDC7AA", "versionEndExcluding": "5.8.15", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read kernel memory, aka CID-6735b4632def."}, {"lang": "es", "value": "Una lectura excesiva de buffer (en la capa framebuffer) en el c\u00f3digo fbcon en el kernel de Linux versiones anteriores a 5.8.15, podr\u00eda ser usada por unos atacantes locales para leer la memoria del kernel, tambi\u00e9n se conoce como CID-6735b4632def"}], "id": "CVE-2020-28915", "lastModified": "2024-11-21T05:23:17.130", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 6.1, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:C", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 8.5, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "[email protected]", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "PHYSICAL", "availabilityImpact": "HIGH", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 0.3, "impactScore": 5.5, "source": "[email protected]", "type": "Primary"}]}, "published": "2020-11-18T08:15:12.180", "references": [{"source": "[email protected]", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.suse.com/show_bug.cgi?id=1178886"}, {"source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.15"}, {"source": "[email protected]", "tags": ["Patch", "Vendor Advisory"], "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5af08640795b2b9a940c9266c0260455377ae262"}, {"source": "[email protected]", "tags": ["Patch", "Vendor Advisory"], "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6735b4632def0640dbdf4eb9f99816aca18c4f16"}, {"source": "[email protected]", "tags": ["Patch", "Third Party Advisory"], "url": "https://syzkaller.appspot.com/bug?id=08b8be45afea11888776f897895aef9ad1c3ecfd"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.suse.com/show_bug.cgi?id=1178886"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.15"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5af08640795b2b9a940c9266c0260455377ae262"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6735b4632def0640dbdf4eb9f99816aca18c4f16"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://syzkaller.appspot.com/bug?id=08b8be45afea11888776f897895aef9ad1c3ecfd"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "[email protected]", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2022:5344", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-372.13.1.rt7.170.el8_6", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-06-28T00:00:00Z"}, {"advisory": "RHSA-2022:5316", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-372.13.1.el8_6", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2022-06-30T00:00:00Z"}, {"advisory": "RHSA-2022:5316", "cpe": "cpe:/o:redhat:rhev_hypervisor:4.4::el8", "package": "kernel-0:4.18.0-372.13.1.el8_6", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8", "release_date": "2022-06-30T00:00:00Z"}], "bugzilla": {"description": "kernel: out-of-bounds read in fbcon_get_font function", "id": "1899177", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1899177"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H", "status": "verified"}, "cwe": "CWE-125", "details": ["A buffer over-read (at the framebuffer layer) in the fbcon code in the Linux kernel before 5.8.15 could be used by local attackers to read kernel memory, aka CID-6735b4632def.", "An out-of-bounds (OOB) memory access flaw was found in fbcon_get_font() in drivers/video/fbdev/core/fbcon.c in fbcon driver module in the Linux kernel. A bound check failure allows a local attacker with special user privilege to gain access to out-of-bounds memory, leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to integrity and system availability."], "mitigation": {"lang": "en:us", "value": "Add 'nomodeset' option as kernel boot parameter to disable frame buffering (edit /etc/default/grub, and run 'grub2-mkconfig -o /boot/grub2/grub.cfg' and reboot).\n~~~\n# cat /proc/cmdline \nBOOT_IMAGE=(hd0,msdos1)/vmlinuz-4.18.0-147.el8.x86_64 root=/dev/mapper/rhel_rhel8u2--1-root ro crashkernel=auto resume=/dev/mapper/rhel_rhel8u2--1-swap rd.lvm.lv=rhel_rhel8u2-1/root rd.lvm.lv=rhel_rhel8u2-1/swap nomodeset\n# ls -l /dev/fb*\nls: cannot access '/dev/fb*': No such file or directory\n~~~"}, "name": "CVE-2020-28915", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"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": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_mrg:2", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2020-11-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-28915\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-28915"], "threat_severity": "Moderate"}