CVE-2025-38528
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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | 5.13 | 5.15.190 |
| linux / linux_kernel | 5.16 | 6.1.147 |
| linux / linux_kernel | 6.2 | 6.6.100 |
| linux / linux_kernel | 6.7 | 6.12.40 |
| linux / linux_kernel | 6.13 | 6.15.8 |
| linux / linux_kernel | 6.16-rc1 | 6.16-rc1.x |
| linux / linux_kernel | 6.16-rc2 | 6.16-rc2.x |
| linux / linux_kernel | 6.16-rc3 | 6.16-rc3.x |
| linux / linux_kernel | 6.16-rc4 | 6.16-rc4.x |
| linux / linux_kernel | 6.16-rc5 | 6.16-rc5.x |
| linux / linux_kernel | 6.16-rc6 | 6.16-rc6.x |
| debian / debian_linux | 11.0 | 11.0.x |
- https://git.kernel.org/stable/c/1c5f5fd47bbda17cb885fe6f03730702cd53d3f8
- https://git.kernel.org/stable/c/61d5fa45ed13e42af14c7e959baba9908b8ee6d4
- https://git.kernel.org/stable/c/6952aeace93f8c9ea01849efecac24dd3152c9c9
- https://git.kernel.org/stable/c/97303e541e12f1fea97834ec64b98991e8775f39
- https://git.kernel.org/stable/c/e7be679124bae8cf4fa6e40d7e1661baddfb3289
- https://git.kernel.org/stable/c/f8242745871f81a3ac37f9f51853d12854fd0b58
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
Deep Security Visibility Without the Complexity
SynScan provides clear, real-time security insights so you can monitor your attack surface, spot risks early, and act fast—without extra complexity.
- No setup fees
- 5-min deployment
- Cancel anytime