{"api_version":"1","generated_at":"2026-08-02T14:32:10+00:00","cve":"CVE-2025-38528","urls":{"html":"https://cve.report/CVE-2025-38528","api":"https://cve.report/api/cve/CVE-2025-38528.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-38528","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-38528"},"summary":{"title":"bpf: Reject %p% format string in bprintf-like helpers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject %p% format string in bprintf-like helpers\n\nstatic const char fmt[] = \"%p%\";\n    bpf_trace_printk(fmt, sizeof(fmt));\n\nThe above BPF program isn't rejected and causes a kernel warning at\nruntime:\n\n    Please remove unsupported %\\x00 in format string\n    WARNING: CPU: 1 PID: 7244 at lib/vsprintf.c:2680 format_decode+0x49c/0x5d0\n\nThis happens because bpf_bprintf_prepare skips over the second %,\ndetected as punctuation, while processing %p. This patch fixes it by\nnot skipping over punctuation. %\\x00 is then processed in the next\niteration and rejected.","state":"PUBLISHED","assigner":"Linux","published_at":"2025-08-16 12:15:28","updated_at":"2026-07-30 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Reject %p% format string in bprintf-like helpers","CVE":"CVE-2025-38528","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"38528","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject %p% format string in bprintf-like helpers\n\nstatic const char fmt[] = \"%p%\";\n    bpf_trace_printk(fmt, sizeof(fmt));\n\nThe above BPF program isn't rejected and causes a kernel warning at\nruntime:\n\n    Please remove unsupported %\\x00 in format string\n    WARNING: CPU: 1 PID: 7244 at lib/vsprintf.c:2680 format_decode+0x49c/0x5d0\n\nThis happens because bpf_bprintf_prepare skips over the second %,\ndetected as punctuation, while processing %p. This patch fixes it by\nnot skipping over punctuation. %\\x00 is then processed in the next\niteration and rejected.","Type":"Description","Title":"bpf: Reject %p% format string in bprintf-like helpers"}]}}}