CVE-2025-38709

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This causes a mismatch between\nthe block device block size and the block size stored in the superblock\ncausing confusion in various places such as fs/buffer.c. The particular\nissue triggered by syzbot was a warning in __getblk_slow() due to\nrequested buffer size not matching block device block size.\n\nFix the problem by getting exclusive hold of the loop device to change\nits block size. This fails if somebody (such as filesystem) has already\nan exclusive ownership of the block device and thus prevents modifying\nthe loop device under some exclusive owner which doesn't expect it."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nloop: Evitar actualizar el tama\u00f1o de bloque bajo propietario exclusivo\n\nSyzbot encontr\u00f3 un reproductor donde el tama\u00f1o de bloque de un dispositivo loop es cambiado bajo un sistema de archivos montado. Esto causa un desajuste entre el tama\u00f1o de bloque del dispositivo de bloques y el tama\u00f1o de bloque almacenado en el superbloque, causando confusi\u00f3n en varios lugares como fs/buffer.c. El problema particular desencadenado por syzbot fue una advertencia en __getblk_slow() debido a que el tama\u00f1o de b\u00fafer solicitado no coincid\u00eda con el tama\u00f1o de bloque del dispositivo de bloques.\n\nSolucionar el problema adquiriendo un control exclusivo del dispositivo loop para cambiar su tama\u00f1o de bloque. Esto falla si alguien (como un sistema de archivos) ya tiene una propiedad exclusiva del dispositivo de bloques y, por lo tanto, evita modificar el dispositivo loop bajo alg\u00fan propietario exclusivo que no lo espera."}], "id": "CVE-2025-38709", "lastModified": "2026-11-05T22:17:26.557", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38709", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:07:52.218588Z", "version": "2.0.3"}}]}, "published": "2025-09-04T16:15:39.997", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/139a000d20f2f38ce34296feddd641d730fe1c08"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/457d2c5e112fd08dc1039b1ae39a83ec1782360d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/46034518cae95db4abfde990c9ca1a0751855072"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d67b30aefeb7a949040bbb1b4e3b84c5d29a624"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7e49538288e523427beedd26993d446afef1a6fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b928438cc87c0bf7ae078e4b7b6e14261e84c5c5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: loop: Avoid updating block size under exclusive owner", "id": "2393170", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393170"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-38709", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-09-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38709\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38709\nhttps://lore.kernel.org/linux-cve-announce/2025090456-CVE-2025-38709-f62c@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-05T14:02:40.453604+00:00", "updated": "2025-09-05T14:02:40.453675+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}