{"id":"CVE-2024-47728","summary":"bpf: Zero former ARG_PTR_TO_{LONG,INT} args in case of error","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Zero former ARG_PTR_TO_{LONG,INT} args in case of error\n\nFor all non-tracing helpers which formerly had ARG_PTR_TO_{LONG,INT} as input\narguments, zero the value for the case of an error as otherwise it could leak\nmemory. For tracing, it is not needed given CAP_PERFMON can already read all\nkernel memory anyway hence bpf_get_func_arg() and bpf_get_func_ret() is skipped\nin here.\n\nAlso, the MTU helpers mtu_len pointer value is being written but also read.\nTechnically, the MEM_UNINIT should not be there in order to always force init.\nRemoving MEM_UNINIT needs more verifier rework though: MEM_UNINIT right now\nimplies two things actually: i) write into memory, ii) memory does not have\nto be initialized. If we lift MEM_UNINIT, it then becomes: i) read into memory,\nii) memory must be initialized. This means that for bpf_*_check_mtu() we're\nreadding the issue we're trying to fix, that is, it would then be able to\nwrite back into things like .rodata BPF maps. Follow-up work will rework the\nMEM_UNINIT semantics such that the intent can be better expressed. For now\njust clear the *mtu_len on error path which can be lifted later again.","modified":"2026-04-16T04:38:03.344548601Z","published":"2024-10-21T12:14:01.012Z","related":["SUSE-SU-2024:3984-1","SUSE-SU-2024:3986-1","SUSE-SU-2024:4315-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4364-1","SUSE-SU-2024:4376-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","USN-7276-1","USN-7277-1","openSUSE-SU-2024:14500-1","openSUSE-SU-2025:14705-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47728.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4b3786a6c5397dc220b1483d8e2f4867743e966f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/594a9f5a8d2de2573a856e506f77ba7dd2cefc6a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/599d15b6d03356a97bff7a76155c5604c42a2962"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8397bf78988f3ae9dbebb0200189a62a57264980"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a634fa8e480ac2423f86311a602f6295df2c8ed0"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47728.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-47728"},{"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":"d7a4cb9b6705a89937d12c8158a35a3145dc967a"},{"fixed":"8397bf78988f3ae9dbebb0200189a62a57264980"},{"fixed":"a634fa8e480ac2423f86311a602f6295df2c8ed0"},{"fixed":"599d15b6d03356a97bff7a76155c5604c42a2962"},{"fixed":"594a9f5a8d2de2573a856e506f77ba7dd2cefc6a"},{"fixed":"4b3786a6c5397dc220b1483d8e2f4867743e966f"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-47728.json"}}],"schema_version":"1.7.5"}