CVE-2025-38620

{"id": "CVE-2025-38620", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2025-08-22T16:15:35.320", "references": [{"url": "https://git.kernel.org/stable/c/765761851d89c772f482494d452e266795460278", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c7c87046b41a9ef28ee7ac476c369da5b5228bc5", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nzloop: fix KASAN use-after-free of tag set\n\nWhen a zoned loop device, or zloop device, is removed, KASAN enabled\nkernel reports \"BUG KASAN use-after-free\" in blk_mq_free_tag_set(). The\nBUG happens because zloop_ctl_remove() calls put_disk(), which invokes\nzloop_free_disk(). The zloop_free_disk() frees the memory allocated for\nthe zlo pointer. However, after the memory is freed, zloop_ctl_remove()\ncalls blk_mq_free_tag_set(&zlo->tag_set), which accesses the freed zlo.\nHence the KASAN use-after-free.\n\n zloop_ctl_remove()\n put_disk(zlo->disk)\n put_device()\n kobject_put()\n ...\n zloop_free_disk()\n kvfree(zlo)\n blk_mq_free_tag_set(&zlo->tag_set)\n\nTo avoid the BUG, move the call to blk_mq_free_tag_set(&zlo->tag_set)\nfrom zloop_ctl_remove() into zloop_free_disk(). This ensures that\nthe tag_set is freed before the call to kvfree(zlo)."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: zloop: correcci\u00f3n del uso tras liberaci\u00f3n de KASAN del conjunto de etiquetas. Al eliminar un dispositivo de bucle zonificado o un dispositivo zloop, el kernel habilitado para KASAN informa \"BUG KASAN use after-free\" en blk_mq_free_tag_set(). El error se produce porque zloop_ctl_remove() llama a put_disk(), que a su vez invoca zloop_free_disk(). zloop_free_disk() libera la memoria asignada al puntero zloop. Sin embargo, una vez liberada la memoria, zloop_ctl_remove() llama a blk_mq_free_tag_set(&zlo->tag_set), que accede al puntero zloop liberado. De ah\u00ed use-after-free de KASAN. Para evitar el error, mueva la llamada a blk_mq_free_tag_set(&zlo->tag_set) de zloop_ctl_remove() a zloop_free_disk(). Esto garantiza que el conjunto de etiquetas se libere antes de la llamada a kvfree(zlo)."}], "lastModified": "2025-11-26T17:45:17.897", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:6.16:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D6BFC4F7-7099-4420-AF39-DD1CEABB8DF9"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}