{"id":"CVE-2026-98075","published":"2026-09-25T11:17:36.847","lastModified":"2026-09-25T11:17:36.847","description":"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->subprog_cnt > 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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/118212417ba0120d99f84154799f8880f07411f4","tags":[]},{"url":"https://git.kernel.org/stable/c/374b2c5561db80fcdd7cdce44af37a49416f61c7","tags":[]},{"url":"https://git.kernel.org/stable/c/92f0bd0e2b632c6565ac2214a4d7d2ed37e5b9f6","tags":[]},{"url":"https://git.kernel.org/stable/c/d6c39774ae093c9f7009cc4ae918f18fc1af7ae7","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}