CVE-2025-38528bpf: Reject %p% format string in bprintf-like helpers
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 48cac3f4a96ddf08df8e53809ed066de0dc93915 before 97303e541e12f1fea97834ec64b98991e8775f39; from 48cac3f4a96ddf08df8e53809ed066de0dc93915 before 61d5fa45ed13e42af14c7e959baba9908b8ee6d4; from 48cac3f4a96ddf08df8e53809ed066de0dc93915 before e7be679124bae8cf4fa6e40d7e1661baddfb3289; from 48cac3f4a96ddf08df8e53809ed066de0dc93915 before 6952aeace93f8c9ea01849efecac24dd3152c9c9; 48cac3f4a96ddf08df8e53809ed066de0dc93915 builds before 1c5f5fd47bbda17cb885fe6f03730702cd53d3f8; from 48cac3f4a96ddf08df8e53809ed066de0dc93915 before f8242745871f81a3ac37f9f51853d12854fd0b58 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.13 before 5.15.190; from 5.16 before 6.1.147; from 6.2 before 6.6.100; from 6.7 before 6.12.40; from 6.13 before 6.15.8; 6.16; 6.16; 6.16; and 3 more ranges | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/97303e541e12f1fea97834ec64b98991e8775f39patch
- https://git.kernel.org/stable/c/61d5fa45ed13e42af14c7e959baba9908b8ee6d4patch
- https://git.kernel.org/stable/c/e7be679124bae8cf4fa6e40d7e1661baddfb3289patch
- https://git.kernel.org/stable/c/6952aeace93f8c9ea01849efecac24dd3152c9c9patch
- https://git.kernel.org/stable/c/1c5f5fd47bbda17cb885fe6f03730702cd53d3f8patch
- https://git.kernel.org/stable/c/f8242745871f81a3ac37f9f51853d12854fd0b58patch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlmailing-list, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.