{"id":"CVE-2026-98075","summary":"bpf: reject BPF_PSEUDO_FUNC reference to the main program","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: reject BPF_PSEUDO_FUNC reference to the main program\n\nfixups.c:jit_subprogs() rewrites BPF_PSEUDO_FUNC loads to contain real\nfunction addresses. This function is invoked from bpf_jit_subprogs()\nonly when env-\u003esubprog_cnt \u003e 1. Meaning that for any program like\nbelow:\n\n  int main(void *ctx) {\n    void *ptr = main;\n    ...\n    bpf_timer_set_callback(..., ptr);\n    ...\n  }\n\nThe 'ptr' won't be ever converted to contain an address.\nIn combination with e.g. bpf_timer_set_callback() this would lead to a\nfunction call at a bogus address.\n\nInstead of complicating the implementation, just assume that no useful\nprogram needs main to be a sync or async callback and reject\nBPF_PSEUDO_FUNC loads for the main subprogram.","modified":"2026-09-26T03:48:32.321564706Z","published":"2026-09-25T10:24:14.472Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98075.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/118212417ba0120d99f84154799f8880f07411f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/374b2c5561db80fcdd7cdce44af37a49416f61c7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/92f0bd0e2b632c6565ac2214a4d7d2ed37e5b9f6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d6c39774ae093c9f7009cc4ae918f18fc1af7ae7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98075.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98075"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"69c087ba6225b574afb6e505b72cb75242a3d844"},{"fixed":"118212417ba0120d99f84154799f8880f07411f4"},{"fixed":"d6c39774ae093c9f7009cc4ae918f18fc1af7ae7"},{"fixed":"92f0bd0e2b632c6565ac2214a4d7d2ed37e5b9f6"},{"fixed":"374b2c5561db80fcdd7cdce44af37a49416f61c7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98075.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.13.0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98075.json"}}],"schema_version":"1.9.0"}