cve-2021-47604
Vulnerability from cvelistv5
Published
2024-06-19 14:54
Modified
2024-11-04 12:08
Severity ?
Summary
vduse: check that offset is within bounds in get_config()
Impacted products
Vendor Product Version
Linux Linux Version: 5.15
Show details on NVD website


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                "id": "CVE-2021-47604",
                "options": [
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T17:12:14.372380Z",
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    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: check that offset is within bounds in get_config()\n\nThis condition checks \"len\" but it does not check \"offset\" and that\ncould result in an out of bounds read if \"offset \u003e dev-\u003econfig_size\".\nThe problem is that since both variables are unsigned the\n\"dev-\u003econfig_size - offset\" subtraction would result in a very high\nunsigned value.\n\nI think these checks might not be necessary because \"len\" and \"offset\"\nare supposed to already have been validated using the\nvhost_vdpa_config_validate() function.  But I do not know the code\nperfectly, and I like to be safe."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47604",
    "datePublished": "2024-06-19T14:54:03.664Z",
    "dateReserved": "2024-05-24T15:11:00.736Z",
    "dateUpdated": "2024-11-04T12:08:59.856Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47604\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-19T15:15:54.973\",\"lastModified\":\"2024-08-27T16:14:27.793\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvduse: check that offset is within bounds in get_config()\\n\\nThis condition checks \\\"len\\\" but it does not check \\\"offset\\\" and that\\ncould result in an out of bounds read if \\\"offset \u003e dev-\u003econfig_size\\\".\\nThe problem is that since both variables are unsigned the\\n\\\"dev-\u003econfig_size - offset\\\" subtraction would result in a very high\\nunsigned value.\\n\\nI think these checks might not be necessary because \\\"len\\\" and \\\"offset\\\"\\nare supposed to already have been validated using the\\nvhost_vdpa_config_validate() function.  But I do not know the code\\nperfectly, and I like to be safe.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vduse: verifique que el desplazamiento est\u00e9 dentro de los l\u00edmites en get_config() Esta condici\u00f3n verifica \\\"len\\\" pero no verifica \\\"desplazamiento\\\" y eso podr\u00eda resultar en una lectura fuera de los l\u00edmites si \\\" desplazamiento \u0026gt; dev-\u0026gt;config_size\\\". El problema es que, dado que ambas variables no est\u00e1n firmadas, la resta \\\"dev-\u0026gt;config_size - offset\\\" dar\u00eda como resultado un valor sin firmar muy alto. Creo que estas comprobaciones podr\u00edan no ser necesarias porque se supone que \\\"len\\\" y \\\"offset\\\" ya se han validado mediante la funci\u00f3n vhost_vdpa_config_validate(). Pero no conozco el c\u00f3digo a la perfecci\u00f3n y me gusta estar seguro.\"}],\"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:H/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.15\",\"versionEndExcluding\":\"5.15.11\",\"matchCriteriaId\":\"7A70FD7B-2EDC-4C3B-ADE0-880AA759CDD7\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/dc1db0060c02d119fd4196924eff2d1129e9a442\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ebbbc5fea3f648175df1aa3f127c78eb0252cc2a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
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