ghsa-rgj4-j68m-986v
Vulnerability from github
Published
2024-05-21 15:31
Modified
2025-04-30 15:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47276"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-706"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:15Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-rgj4-j68m-986v",
  "modified": "2025-04-30T15:30:44Z",
  "published": "2024-05-21T15:31:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47276"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0bc62e398bbd9e600959e610def5109957437b28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e4ddeb68751fb4fb657199aed9cfd5d02796875"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4aedc2bc2b32c93555f47c95610efb89cc1ec09b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c14133d2d3f768e0a35128faac8aa6ed4815051"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e4e824b109f1d41ccf223fbb0565d877d6223a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/862dcc14f2803c556bdd73b43c27b023fafce2fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97524384762c1fb9b3ded931498dd2047bd0de81"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/acf671ba79c1feccc3ec7cfdcffead4efcec49e7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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