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.
CVSS
No CVSS.
References
Configurations
No configuration.
History
16 Aug 2025, 12:15
Type | Values Removed | Values Added |
---|---|---|
New CVE |
Information
Published : 2025-08-16 12:15
Updated : 2025-08-16 12:15
NVD link : CVE-2025-38528
Mitre link : CVE-2025-38528
CVE.ORG link : CVE-2025-38528
JSON object : View
Products Affected
No product.
CWE
No CWE.