FKIE_CVE-2025-38528

Vulnerability from fkie_nvd - Published: 2025-08-16 12:15 - Updated: 2026-01-07 19:21
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1c5f5fd47bbda17cb885fe6f03730702cd53d3f8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/61d5fa45ed13e42af14c7e959baba9908b8ee6d4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6952aeace93f8c9ea01849efecac24dd3152c9c9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97303e541e12f1fea97834ec64b98991e8775f39Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e7be679124bae8cf4fa6e40d7e1661baddfb3289Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f8242745871f81a3ac37f9f51853d12854fd0b58Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory, Mailing List
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
debian debian_linux 11.0
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject %p% format string in bprintf-like helpers\n\nstatic const char fmt[] = \"%p%\";\n    bpf_trace_printk(fmt, sizeof(fmt));\n\nThe above BPF program isn\u0027t rejected and causes a kernel warning at\nruntime:\n\n    Please remove unsupported %\\x00 in format string\n    WARNING: CPU: 1 PID: 7244 at lib/vsprintf.c:2680 format_decode+0x49c/0x5d0\n\nThis happens because bpf_bprintf_prepare skips over the second %,\ndetected as punctuation, while processing %p. This patch fixes it by\nnot skipping over punctuation. %\\x00 is then processed in the next\niteration and rejected."
    },
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Rechazo de la cadena de formato %p% en ayudantes similares a bprintf. static const char fmt[] = \"%p%\"; bpf_trace_printk(fmt, sizeof(fmt)); El programa BPF anterior no se rechaza y genera una advertencia del kernel en tiempo de ejecuci\u00f3n: Por favor, elimine el %\\x00 no compatible en la cadena de formato. ADVERTENCIA: CPU: 1 PID: 7244 en lib/vsprintf.c:2680 format_decode+0x49c/0x5d0. Esto ocurre porque bpf_bprintf_prepare omite el segundo %, detectado como signo de puntuaci\u00f3n, al procesar %p. Este parche lo corrige al no omitir la puntuaci\u00f3n. %\\x00 se procesa en la siguiente iteraci\u00f3n y se rechaza."
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  "id": "CVE-2025-38528",
  "lastModified": "2026-01-07T19:21:55.550",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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