Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
Linux Linux — bpf: Reject %p% format string in bprintf-like helpers
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L L N U N N H 5.5 .0016 5.7 —
AFFECTED
Product Versions Fixed
Linux 48cac3f4a96ddf08df8e53809ed066de0dc93915 – —
Linux 5.13 – 5.15.190
TIMELINE
Apr 16 Reserved by Linux
Aug 16 Published (CNA: Linux)
Jul 30 RESCORED — CVE-2025-38528 (Linux). CVSS 7.1 → 5.5 (NVD).
Description
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
| April 16, 2025 | Reserved | Reserved by Linux |
| August 16, 2025 | Published | Published (CNA: Linux) |
| July 30, 2026 | RESCORED | RESCORED — CVE-2025-38528 (Linux). CVSS 7.1 → 5.5 (NVD). |
Affected
Affected products and packages — 2 rows
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
| Linux | Linux | — | 48cac3f4a96ddf08df8e53809ed066de0dc93915 | — |
| Linux | Linux | — | 5.13 | 5.15.190 |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2025-38528 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.