CVE-2025-38528 (GCVE-0-2025-38528)
Vulnerability from cvelistv5
Published
2025-08-16 11:12
Modified
2026-10-15 21:52
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject %p% format string in bprintf-like helpers static const char fmt[] = "%p%"; bpf_trace_printk(fmt, sizeof(fmt)); The above BPF program isn't rejected and causes a kernel warning at runtime: Please remove unsupported %\x00 in format string WARNING: CPU: 1 PID: 7244 at lib/vsprintf.c:2680 format_decode+0x49c/0x5d0 This happens because bpf_bprintf_prepare skips over the second %, detected as punctuation, while processing %p. This patch fixes it by not skipping over punctuation. %\x00 is then processed in the next iteration and rejected.
References
Impacted products
Vendor Product Version
Linux Linux Version: 48cac3f4a96ddf08df8e53809ed066de0dc93915
Version: 48cac3f4a96ddf08df8e53809ed066de0dc93915
Version: 48cac3f4a96ddf08df8e53809ed066de0dc93915
Version: 48cac3f4a96ddf08df8e53809ed066de0dc93915
Version: 48cac3f4a96ddf08df8e53809ed066de0dc93915
Version: 48cac3f4a96ddf08df8e53809ed066de0dc93915
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}


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