cve-2021-46945
Vulnerability from cvelistv5
Published
2024-02-27 18:40
Modified
2024-11-04 11:56
Severity ?
Summary
ext4: always panic when errors=panic is specified
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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                "id": "CVE-2021-46945",
                "options": [
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                    "Exploitation": "none"
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-06-28T17:01:37.364142Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
      },
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:17:43.032Z",
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    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/super.c"
          ],
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          "vendor": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: always panic when errors=panic is specified\n\nBefore commit 014c9caa29d3 (\"ext4: make ext4_abort() use\n__ext4_error()\"), the following series of commands would trigger a\npanic:\n\n1. mount /dev/sda -o ro,errors=panic test\n2. mount /dev/sda -o remount,abort test\n\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\u0027s 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 \u003e /sys/fs/ext4/sda/trigger_fs_error\n\nHowever, this makes ext4\u0027s behaviour much more consistent, so this is\na good thing."
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        "dateUpdated": "2024-11-04T11:56:25.093Z",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-46945",
    "datePublished": "2024-02-27T18:40:31.095Z",
    "dateReserved": "2024-02-25T13:45:52.721Z",
    "dateUpdated": "2024-11-04T11:56:25.093Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.1",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46945\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-27T19:04:06.190\",\"lastModified\":\"2024-04-10T20:11:52.607\",\"vulnStatus\":\"Analyzed\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: always panic when errors=panic is specified\\n\\nBefore commit 014c9caa29d3 (\\\"ext4: make ext4_abort() use\\n__ext4_error()\\\"), the following series of commands would trigger a\\npanic:\\n\\n1. mount /dev/sda -o ro,errors=panic test\\n2. mount /dev/sda -o remount,abort test\\n\\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\u0027s 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 \u003e /sys/fs/ext4/sda/trigger_fs_error\\n\\nHowever, this makes ext4\u0027s 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 \u0026gt; /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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.0\",\"versionEndExcluding\":\"5.11.20\",\"matchCriteriaId\":\"EFB425F0-C28C-4B44-8B4C-AD512AA832DE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12.0\",\"versionEndExcluding\":\"5.12.3\",\"matchCriteriaId\":\"C3814FA3-8141-4313-A852-8C4212BE12AD\"}]}]}],\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
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