{"id":"CVE-2026-93270","summary":"bpf: Disallow interpreter fallback for BPF_ADDR_PERCPU insn","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Disallow interpreter fallback for BPF_ADDR_PERCPU insn\n\nThe BPF_MOV64_PERCPU_REG insn requires JIT to emit native code to for\n'dst_reg = src_reg + \u003cpercpu_base_off\u003e'.\n\nHowever, the interpreter ignores the 'off' at its ALU64_MOV_X label.\nThe 'off' indicates the insn is BPF_MOV64_PERCPU_REG insn. Then, when\nthe interpreter loads memory from the register, it will hit a page\nfault.\n\n[    2.545572] BUG: unable to handle page fault for address: ffffffffacaaf034\n[    2.546485] #PF: supervisor read access in kernel mode\n[    2.547167] #PF: error_code(0x0000) - not-present page\n[    2.547850] PGD 134e63067 P4D 134e63067 PUD 134e64063 PMD 10021c063 PTE 800ffffeca550062\n[    2.548912] Oops: Oops: 0000 [#1] SMP PTI\n\nSet jit_required as true in order to disallow interpreter fallback in\ncore.c::__bpf_prog_select_runtime(), if any BPF_ADDR_PERCPU insn is\npatched to the prog.\n\nBTW, rename the helper bpf_map_supports_cpu_flags() to\nbpf_map_is_percpu_map().","modified":"2026-09-26T03:48:39.439266355Z","published":"2026-09-24T15:52:09.868Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93270.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/57cf929a33cb76be3f24886073ae820b4c496914"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a0855e73757ee9cf25ba635a1c735018ecba742"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93270.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93270"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7bdbf7446305cb65c510c16d57cde82bc76b234a"},{"fixed":"57cf929a33cb76be3f24886073ae820b4c496914"},{"fixed":"7a0855e73757ee9cf25ba635a1c735018ecba742"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93270.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.10.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93270.json"}}],"schema_version":"1.9.0"}