GHSA-RGJ4-J68M-986V
Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2025-04-30 15:30In 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.
{
"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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