CVE-2021-46945

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This commit will\nrestore the behaviour immediately before commit 014c9caa29d3.\n(However, note that the Linux kernel's behavior has not been\nconsistent; some previous kernel versions, including 5.4 and 4.19\nsimilarly did not panic after using the mount option \"abort\".)\n\nThis also makes a change to long-standing behaviour; namely, the\nfollowing series commands will now cause a panic, when previously it\ndid not:\n\n1. mount /dev/sda -o ro,errors=panic test\n2. echo test > /sys/fs/ext4/sda/trigger_fs_error\n\nHowever, this makes ext4's behaviour much more consistent, so this is\na good thing."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: siempre entra en p\u00e1nico cuando se especifica errores=panic Antes del commit 014c9caa29d3 (\"ext4: make ext4_abort() use __ext4_error()\"), la siguiente serie de comandos desencadenar\u00eda un p\u00e1nico: 1. mount /dev/sda -o ro,errors=panic test 2. mount /dev/sda -o remount,abort test Despu\u00e9s de el commit 014c9caa29d3, volver a montar un sistema de archivos utilizando la opci\u00f3n de montaje de prueba \"abort\" ya no provocar\u00e1 p\u00e1nico . Esta confirmaci\u00f3n restaurar\u00e1 el comportamiento inmediatamente anterior a el commit 014c9caa29d3. (Sin embargo, tenga en cuenta que el comportamiento del kernel de Linux no ha sido consistente; algunas versiones anteriores del kernel, incluidas 5.4 y 4.19, tampoco entraron en p\u00e1nico despu\u00e9s de usar la opci\u00f3n de montaje \"abortar\".) Esto tambi\u00e9n supone un cambio en el comportamiento de larga data; es decir, los siguientes comandos de la serie ahora causar\u00e1n p\u00e1nico, cuando antes no lo hac\u00edan: 1. mount /dev/sda -o ro,errors=panic test 2. echo test > /sys/fs/ext4/sda/trigger_fs_error Sin embargo, Esto hace que el comportamiento de ext4 sea mucho m\u00e1s consistente, por lo que es algo bueno."}], "id": "CVE-2021-46945", "lastModified": "2026-06-17T04:15:56.467", "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-2021-46945", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-28T17:01:37.364142Z", "version": "2.0.3"}}]}, "published": "2024-02-27T19:04:06.190", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e9ea8f4637026b8e965128953f2da061ccae9c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64e1eebe2131183174f4fbb6b1491355f96c6cde"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac2f7ca51b0929461ea49918f27c11b680f28995"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e9ea8f4637026b8e965128953f2da061ccae9c4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64e1eebe2131183174f4fbb6b1491355f96c6cde"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac2f7ca51b0929461ea49918f27c11b680f28995"}], "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: ext4: always panic when errors=panic is specified", "id": "2266486", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266486"}, "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:\next4: always panic when errors=panic is specified\nBefore commit 014c9caa29d3 (\"ext4: make ext4_abort() use\n__ext4_error()\"), the following series of commands would trigger a\npanic:\n1. mount /dev/sda -o ro,errors=panic test\n2. mount /dev/sda -o remount,abort test\nAfter commit 014c9caa29d3, remounting a file system using the test\nmount option \"abort\" will no longer trigger a panic. This commit will\nrestore the behaviour immediately before commit 014c9caa29d3.\n(However, note that the Linux kernel's behavior has not been\nconsistent; some previous kernel versions, including 5.4 and 4.19\nsimilarly did not panic after using the mount option \"abort\".)\nThis also makes a change to long-standing behaviour; namely, the\nfollowing series commands will now cause a panic, when previously it\ndid not:\n1. mount /dev/sda -o ro,errors=panic test\n2. echo test > /sys/fs/ext4/sda/trigger_fs_error\nHowever, this makes ext4's behaviour much more consistent, so this is\na good thing."], "name": "CVE-2021-46945", "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": "2024-02-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-46945\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-46945\nhttps://lore.kernel.org/linux-cve-announce/20240227184057.2368370-10-gregkh@linuxfoundation.org/T/#u"], "threat_severity": "Moderate"}

{}