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This can\npotentially also lead to deadlocks, as reported by syzbot in [0].\n\nSo, instead, hold freeze_mutex only during writeability checks, bump\n(proactively) \"write active\" count for the map, unlock the mutex and\nproceed with mmap logic. 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The way we\nnaively do this means we'll hold freeze_mutex for entire duration of all\nthe mm and VMA manipulations, which is completely unnecessary. This can\npotentially also lead to deadlocks, as reported by syzbot in [0].\n\nSo, instead, hold freeze_mutex only during writeability checks, bump\n(proactively) \"write active\" count for the map, unlock the mutex and\nproceed with mmap logic. And only if something went wrong during mmap\nlogic, then undo that \"write active\" counter increment.\n\n [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: evitar mantener freeze_mutex durante la operaci\u00f3n mmap. Usamos map->freeze_mutex para evitar ejecuciones entre map_freeze() y el mapeo de memoria del contenido del mapa BPF con permisos de escritura. Esta forma ingenua de hacerlo implica mantener freeze_mutex durante todas las manipulaciones mm y VMA, lo cual es completamente innecesario. Esto tambi\u00e9n puede provocar interbloqueos, como informa syzbot en [0]. Por lo tanto, se mantiene freeze_mutex solo durante las comprobaciones de escritura, se aumenta (proactivamente) el contador de \"escritura activa\" del mapa, se desbloquea el mutex y se contin\u00faa con la l\u00f3gica mmap. Solo si algo falla durante la l\u00f3gica mmap, se deshace el incremento del contador de \"escritura activa\". [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/"}], "id": "CVE-2025-21853", "lastModified": "2025-11-03T20:17:22.183", "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": "2025-03-12T10:15:18.063", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/271e49f8a58edba65bc2b1250a0abaa98c4bfdbe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/29cfda62ab4d92ab94123813db49ab76c1e61b29"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2ce31c97c219b4fe797749f950274f246eb88c49"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4759acbd44d24a69b7b14848012ec4201d6c5501"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bc27c52eea189e8f7492d40739b7746d67b65beb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "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: bpf: avoid holding freeze_mutex during mmap operation", "id": "2351613", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2351613"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: avoid holding freeze_mutex during mmap operation\nWe use map->freeze_mutex to prevent races between map_freeze() and\nmemory mapping BPF map contents with writable permissions. The way we\nnaively do this means we'll hold freeze_mutex for entire duration of all\nthe mm and VMA manipulations, which is completely unnecessary. This can\npotentially also lead to deadlocks, as reported by syzbot in [0].\nSo, instead, hold freeze_mutex only during writeability checks, bump\n(proactively) \"write active\" count for the map, unlock the mutex and\nproceed with mmap logic. And only if something went wrong during mmap\nlogic, then undo that \"write active\" counter increment.\n[0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/"], "name": "CVE-2025-21853", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "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": "2025-03-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21853\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21853\nhttps://lore.kernel.org/linux-cve-announce/2025031214-CVE-2025-21853-cf76@gregkh/T"], "threat_severity": "Moderate"}

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