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{"bugzilla": {"description": "kernel: out-of-bounds read/write in the bpf verifier", "id": "1817350", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1817350"}, "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"}, "cwe": "(CWE-125|CWE-787)", "details": ["In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)", "An out-of-bounds access flaw was found in the Linux kernel\u2019s implementation of the eBPF code verifier, where an incorrect register bounds calculation while checking 32-bit instructions in an eBPF program occurs. This flaw allows an unprivileged user or process to execute eBPF programs to crash the kernel, resulting in a denial of service or potentially gaining root privileges on the system."], "mitigation": {"lang": "en:us", "value": "The Linux kernel versions as shipped with Red Hat Enterprise Linux 5, 6, 7, 8 and Red Hat Enterprise Linux MRG 2 are not affected because they did not backport the commit\n581738a681b6 (\"bpf: Provide better register bounds after jmp32 instructions\")\nwhich introduced this issue. Also by default unprivileged user are not allowed to access bpf(2) syscall.\nFedora kernel allows unprivileged users to access to bpf(2) syscall by default and is prone to this issue. To disable unprivileged access to bpf(2) sycall set following sysctl(8) variable:\n# sysctl -w kernel.unprivileged_bpf_disabled=1"}, "name": "CVE-2020-8835", "package_state": [{"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"}, {"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-alt", "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:/a:redhat:enterprise_mrg:2", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2020-03-30T16:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-8835\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-8835"], "statement": "This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and 8 and Red Hat Enterprise MRG 2.", "threat_severity": "Important"}