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CVE PROGRAM SOURCE RECORD7.1 High

CVE-2025-38528

bpf: Reject %p% format string in bprintf-like helpers

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 48cac3f4a96ddf08df8e53809ed066de0dc93915 to < 97303e541e12f1fea97834ec64b98991e8775f39affected
  • 48cac3f4a96ddf08df8e53809ed066de0dc93915 to < 61d5fa45ed13e42af14c7e959baba9908b8ee6d4affected
  • 48cac3f4a96ddf08df8e53809ed066de0dc93915 to < e7be679124bae8cf4fa6e40d7e1661baddfb3289affected
  • 48cac3f4a96ddf08df8e53809ed066de0dc93915 to < 6952aeace93f8c9ea01849efecac24dd3152c9c9affected
  • 48cac3f4a96ddf08df8e53809ed066de0dc93915 to < 1c5f5fd47bbda17cb885fe6f03730702cd53d3f8affected
  • 48cac3f4a96ddf08df8e53809ed066de0dc93915 to < f8242745871f81a3ac37f9f51853d12854fd0b58affected

Linux Linux

Default version status: affected

  • 5.13affected
  • 0 to < 5.13unaffected
  • 5.15.190 to ≤ 5.15.*unaffected
  • 6.1.147 to ≤ 6.1.*unaffected
  • 6.6.100 to ≤ 6.6.*unaffected
  • 6.12.40 to ≤ 6.12.*unaffected
  • 6.15.8 to ≤ 6.15.*unaffected
  • 6.16 to ≤ *unaffected

References