CVE-2025-38528

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux48cac3f4a96ddf08df8e53809ed066de0dc93915 < 97303e541e12f1fea97834ec64b98991e8775f39affected
LinuxLinux48cac3f4a96ddf08df8e53809ed066de0dc93915 < 61d5fa45ed13e42af14c7e959baba9908b8ee6d4affected
LinuxLinux48cac3f4a96ddf08df8e53809ed066de0dc93915 < e7be679124bae8cf4fa6e40d7e1661baddfb3289affected
LinuxLinux48cac3f4a96ddf08df8e53809ed066de0dc93915 < 6952aeace93f8c9ea01849efecac24dd3152c9c9affected
LinuxLinux48cac3f4a96ddf08df8e53809ed066de0dc93915 < 1c5f5fd47bbda17cb885fe6f03730702cd53d3f8affected
LinuxLinux48cac3f4a96ddf08df8e53809ed066de0dc93915 < f8242745871f81a3ac37f9f51853d12854fd0b58affected
LinuxLinux5.13affected
LinuxLinux0 < 5.13unaffected
LinuxLinux5.15.190 <= 5.15.*unaffected
LinuxLinux6.1.147 <= 6.1.*unaffected
LinuxLinux6.6.100 <= 6.6.*unaffected
LinuxLinux6.12.40 <= 6.12.*unaffected
LinuxLinux6.15.8 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References