CVE-2021-47276 (GCVE-0-2021-47276)
Vulnerability from cvelistv5
Published
2024-05-21 14:20
Modified
2025-05-04 07:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftrace_init(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftrace_bug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address. Instead, read the ip address with copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7 Patch
Impacted products
Vendor Product Version
Linux Linux Version: 05736a427f7e16be948ccbf39782bd3a6ae16b14
Version: 05736a427f7e16be948ccbf39782bd3a6ae16b14
Version: 05736a427f7e16be948ccbf39782bd3a6ae16b14
Version: 05736a427f7e16be948ccbf39782bd3a6ae16b14
Version: 05736a427f7e16be948ccbf39782bd3a6ae16b14
Version: 05736a427f7e16be948ccbf39782bd3a6ae16b14
Version: 05736a427f7e16be948ccbf39782bd3a6ae16b14
Version: 05736a427f7e16be948ccbf39782bd3a6ae16b14
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47276\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:15.983\",\"lastModified\":\"2025-04-30T14:46:07.833\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nftrace: Do not blindly read the ip address in ftrace_bug()\\n\\nIt was reported that a bug on arm64 caused a bad ip address to be used for\\nupdating into a nop in ftrace_init(), but the error path (rightfully)\\nreturned -EINVAL and not -EFAULT, as the bug caused more than one error to\\noccur. But because -EINVAL was returned, the ftrace_bug() tried to report\\nwhat was at the location of the ip address, and read it directly. This\\ncaused the machine to panic, as the ip was not pointing to a valid memory\\naddress.\\n\\nInstead, read the ip address with copy_from_kernel_nofault() to safely\\naccess the memory, and if it faults, report that the address faulted,\\notherwise report what was in that location.\"},{\"lang\":\"es\",\"value\":\" En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ftrace: no lea ciegamente la direcci\u00f3n IP en ftrace_bug(). Se inform\u00f3 que un error en arm64 provoc\u00f3 que se usara una direcci\u00f3n IP incorrecta para actualizar a un nop en ftrace_init() , pero la ruta de error (con raz\u00f3n) devolvi\u00f3 -EINVAL y no -EFAULT, ya que el error provoc\u00f3 que ocurriera m\u00e1s de un error. Pero debido a que se devolvi\u00f3 -EINVAL, ftrace_bug() intent\u00f3 informar qu\u00e9 hab\u00eda en la ubicaci\u00f3n de la direcci\u00f3n IP y leerlo directamente. Esto provoc\u00f3 que la m\u00e1quina entrara en p\u00e1nico, ya que la IP no apuntaba a una direcci\u00f3n de memoria v\u00e1lida. En su lugar, lea la direcci\u00f3n IP con copy_from_kernel_nofault() para acceder de forma segura a la memoria y, si falla, informe que la direcci\u00f3n fall\u00f3; de lo contrario, informe qu\u00e9 hab\u00eda en esa 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      "cveMetadata": "{\"cveId\": \"CVE-2021-47276\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:07:43.402Z\", \"dateReserved\": \"2024-05-21T13:27:52.128Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:20:04.023Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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