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Thus causing a deadlock.\n\nIn the first place, it is unexpected that folios/pages in the middle of\nwriteback will be updated and become dirty. Nilfs2 adds a checksum to\nverify the validity of the log being written and uses it for recovery at\nmount, so data changes during writeback are suppressed. Since this is\nbroken, an unclean shutdown could potentially cause recovery to fail.\n\nInvestigation revealed that the root cause is that the wait for writeback\ncompletion in nilfs_page_mkwrite() is conditional, and if the backing\ndevice does not require stable writes, data may be modified without\nwaiting.\n\nFix these issues by making nilfs_page_mkwrite() wait for writeback to\nfinish regardless of the stable write requirement of the backing device."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: nilfs2: corrige un bloqueo en nilfs_lookup_dirty_data_buffers() Syzbot inform\u00f3 un problema de bloqueo en migrar_pages_batch() llamado por mbind() y nilfs_lookup_dirty_data_buffers() llamado en el escritor de registros de nilfs2. Mientras migrar_pages_batch() bloquea una publicaci\u00f3n y espera a que se complete la reescritura, el subproceso del escritor de registros que deber\u00eda completar la reescritura recoge la publicaci\u00f3n que se est\u00e1 reescribiendo en nilfs_lookup_dirty_data_buffers() que solicita la creaci\u00f3n de registros posteriores y estaba intentando bloquear la fol. Provocando as\u00ed un punto muerto. En primer lugar, es inesperado que los folios/p\u00e1ginas en medio de la reescritura se actualicen y se ensucien. Nilfs2 agrega una suma de verificaci\u00f3n para verificar la validez del registro que se est\u00e1 escribiendo y la usa para la recuperaci\u00f3n en el montaje, de modo que se suprimen los cambios de datos durante la reescritura. Dado que esto no funciona, un cierre incorrecto podr\u00eda provocar que falle la recuperaci\u00f3n. La investigaci\u00f3n revel\u00f3 que la causa principal es que la espera para que se complete la reescritura en nilfs_page_mkwrite() es condicional, y si el dispositivo de respaldo no requiere escrituras estables, los datos se pueden modificar sin esperar. Solucione estos problemas haciendo que nilfs_page_mkwrite() espere a que finalice la reescritura independientemente del requisito de escritura estable del dispositivo de respaldo."}], "id": "CVE-2024-26696", "lastModified": "2025-03-17T15:37:03.493", "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": "2024-04-03T15:15:52.830", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/228742b2ddfb99dfd71e5a307e6088ab6836272e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38296afe3c6ee07319e01bb249aa4bb47c07b534"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7e9b622bd0748cc104d66535b76d9b3535f9dc0f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8494ba2c9ea00a54d5b50e69b22c55a8958bce32"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/862ee4422c38be5c249844a684b00d0dbe9d1e46"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/98a4026b22ff440c7f47056481bcbbe442f607d6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e38585401d464578d30f5868ff4ca54475c34f7d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ea5ddbc11613b55e5128c85f57b08f907abd9b28"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/228742b2ddfb99dfd71e5a307e6088ab6836272e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38296afe3c6ee07319e01bb249aa4bb47c07b534"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7e9b622bd0748cc104d66535b76d9b3535f9dc0f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8494ba2c9ea00a54d5b50e69b22c55a8958bce32"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/862ee4422c38be5c249844a684b00d0dbe9d1e46"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/98a4026b22ff440c7f47056481bcbbe442f607d6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e38585401d464578d30f5868ff4ca54475c34f7d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ea5ddbc11613b55e5128c85f57b08f907abd9b28"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: nilfs2: fix hang in nilfs_lookup_dirty_data_buffers()", "id": "2273121", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2273121"}, "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-1246", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnilfs2: fix hang in nilfs_lookup_dirty_data_buffers()\nSyzbot reported a hang issue in migrate_pages_batch() called by mbind()\nand nilfs_lookup_dirty_data_buffers() called in the log writer of nilfs2.\nWhile migrate_pages_batch() locks a folio and waits for the writeback to\ncomplete, the log writer thread that should bring the writeback to\ncompletion picks up the folio being written back in\nnilfs_lookup_dirty_data_buffers() that it calls for subsequent log\ncreation and was trying to lock the folio. Thus causing a deadlock.\nIn the first place, it is unexpected that folios/pages in the middle of\nwriteback will be updated and become dirty. Nilfs2 adds a checksum to\nverify the validity of the log being written and uses it for recovery at\nmount, so data changes during writeback are suppressed. Since this is\nbroken, an unclean shutdown could potentially cause recovery to fail.\nInvestigation revealed that the root cause is that the wait for writeback\ncompletion in nilfs_page_mkwrite() is conditional, and if the backing\ndevice does not require stable writes, data may be modified without\nwaiting.\nFix these issues by making nilfs_page_mkwrite() wait for writeback to\nfinish regardless of the stable write requirement of the backing device."], "name": "CVE-2024-26696", "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": "2024-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26696\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26696\nhttps://lore.kernel.org/linux-cve-announce/2024040338-CVE-2024-26696-9dff@gregkh/T"], "threat_severity": "Low"}

{}