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LFS est\u00e1 configurado para buscar la secci\u00f3n de origen durante la GC, la v\u00edctima no debe tener datos de puntos de control, ya que despu\u00e9s de la GC, la secci\u00f3n no se puede liberar para su reutilizaci\u00f3n. Anteriormente, solo verific\u00e1bamos los bloques chpt v\u00e1lidos en el segmento actual en lugar de en la secci\u00f3n, lo arreglamos. 2. RSS | AT_SSR est\u00e1 configurado para encontrar un segmento de destino para escrituras que se puede llenar completamente con bloques reci\u00e9n escritos y con puntos de control. Nunca debemos seleccionar dicho segmento; de lo contrario, puede causar p\u00e1nico o corrupci\u00f3n de datos durante la asignaci\u00f3n. El caso potencial se describe a continuaci\u00f3n: a) segmento de destino tiene 'n' (n &lt; 512) ckpt bloques v\u00e1lidos b) GC migra 'n' bloques v\u00e1lidos a otro segmento (el segmento todav\u00eda est\u00e1 en la lista sucia) c) GC migra '512 - n' bloques al segmento objetivo (el segmento tiene 'n ' cp_vblocks y '512 - n' vblocks) d) Si GC selecciona el segmento de destino mediante el asignador {AT,}SSR, sin embargo, no hay espacio libre en el segmento de destino."}], "id": "CVE-2021-47004", "lastModified": "2025-01-08T17:43:50.870", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2024-02-28T09:15:38.353", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db"}], "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: f2fs: fix to avoid touching checkpointed data in get_victim()", "id": "2266863", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266863"}, "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"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nf2fs: fix to avoid touching checkpointed data in get_victim()\nIn CP disabling mode, there are two issues when using LFS or SSR | AT_SSR\nmode to select victim:\n1. LFS is set to find source section during GC, the victim should have\nno checkpointed data, since after GC, section could not be set free for\nreuse.\nPreviously, we only check valid chpt blocks in current segment rather\nthan section, fix it.\n2. SSR | AT_SSR are set to find target segment for writes which can be\nfully filled by checkpointed and newly written blocks, we should never\nselect such segment, otherwise it can cause panic or data corruption\nduring allocation, potential case is described as below:\na) target segment has 'n' (n < 512) ckpt valid blocks\nb) GC migrates 'n' valid blocks to other segment (segment is still\nin dirty list)\nc) GC migrates '512 - n' blocks to target segment (segment has 'n'\ncp_vblocks and '512 - n' vblocks)\nd) If GC selects target segment via {AT,}SSR allocator, however there\nis no free space in targe segment."], "name": "CVE-2021-47004", "package_state": [{"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": "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47004\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47004\nhttps://lore.kernel.org/linux-cve-announce/2024022829-CVE-2021-47004-8544@gregkh/T/#u"], "threat_severity": "Moderate"}