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This patch fixes it by\nnot skipping over punctuation. %\\x00 is then processed in the next\niteration and rejected."}, {"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."}], "id": "CVE-2025-38528", "lastModified": "2026-01-07T19:21:55.550", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-08-16T12:15:28.313", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1c5f5fd47bbda17cb885fe6f03730702cd53d3f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/61d5fa45ed13e42af14c7e959baba9908b8ee6d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6952aeace93f8c9ea01849efecac24dd3152c9c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97303e541e12f1fea97834ec64b98991e8775f39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e7be679124bae8cf4fa6e40d7e1661baddfb3289"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f8242745871f81a3ac37f9f51853d12854fd0b58"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bpf: Reject %p% format string in bprintf-like helpers", "id": "2388943", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2388943"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Reject %p% format string in bprintf-like helpers\nstatic const char fmt[] = \"%p%\";\nbpf_trace_printk(fmt, sizeof(fmt));\nThe above BPF program isn't rejected and causes a kernel warning at\nruntime:\nPlease remove unsupported %\\x00 in format string\nWARNING: CPU: 1 PID: 7244 at lib/vsprintf.c:2680 format_decode+0x49c/0x5d0\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."], "name": "CVE-2025-38528", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-08-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38528\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38528\nhttps://lore.kernel.org/linux-cve-announce/2025081654-CVE-2025-38528-153c@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-08-18T20:50:06.795602+00:00", "updated": "2025-08-18T20:50:06.795655+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}