{"id":"CVE-2026-98150","revision":"0f156a6b90b4440bb8595702a59d6471","records":[{"revision":"0f156a6b90b4440bb8595702a59d6471","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98150","aliases":[],"title":"bpf: Fix BPF_F_CPU validation for sparse CPU IDs","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix BPF_F_CPU validation for sparse CPU IDs\n\nBPF_F_CPU stores the target CPU ID in the upper 32 bits of the map\noperation flags. bpf_map_check_op_flags() currently compares that ID\nwith num_possible_cpus(), which is the number of possible CPUs rather\nthan a bound on CPU IDs.\n\nOn an arm64 QEMU guest with a CPU device-tree hole, the possible CPU\nmask was 0,2-3. A userspace program using raw bpf() syscalls creates\na BPF_MAP_TYPE_PERCPU_ARRAY and performs update and lookup operations\nfor each CPU by setting BPF_F_CPU and the CPU ID in the flags.\n\nWith the old check, CPU 1 is incorrectly accepted while valid CPU 3 is\nrejected with -ERANGE. The CPU 1 update then reaches the per-CPU map\naccess path and triggers:\n\n  Unable to handle kernel paging request at virtual address ...\n  pc : __pi_memcpy_generic+0x5c/0x22c\n  lr : bpf_percpu_array_update+0x2dc/0x2e8\n  Call trace:\n    __pi_memcpy_generic\n    bpf_map_update_value\n    map_update_elem\n    __sys_bpf\n\nCheck the CPU ID against nr_cpu_ids and cpu_possible() instead. This\nrejects CPU IDs outside the valid range and CPUs absent from the\npossible mask, while allowing valid sparse CPU IDs.","state":0,"publishedAt":"2026-09-25T10:36:22.774+00:00","modifiedAt":"2026-10-19T09:14:43.287+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"include/linux/bpf.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2b421662c7887a0649fe409155a1f101562d0fa9\",\n                            \"lessThan\": \"bdc5941f6eeef90b76a07fd8ca38ac1933ba2195\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2b421662c7887a0649fe409155a1f101562d0fa9\",\n                            \"lessThan\": \"ed54bf564ac52699cf4def3d0c2125d493e756f9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"include/linux/bpf.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"7.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/bdc5941f6eeef90b76a07fd8ca38ac1933ba2195","https://git.kernel.org/stable/c/ed54bf564ac52699cf4def3d0c2125d493e756f9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98150","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98150","identifiers":["CVE-2026-98150"]},"retained":false,"historicalAffected":[]}],"coverage":[]}