GHSA-JRGC-M5WF-7PCH
Vulnerability from github – Published: 2023-07-06 19:24 – Updated: 2023-07-06 19:24A heap out-of-bounds read/write vulnerability in the Linux Kernel traffic control (QoS) subsystem can be exploited to achieve local privilege escalation.
The qfq_change_class function does not properly limit the lmax variable which can lead to out-of-bounds read/write. If the TCA_QFQ_LMAX value is not offered through nlattr, lmax is determined by the MTU value of the network device. The MTU of the loopback device can be set up to 2^31-1 and as a result, it is possible to have an lmax value that exceeds QFQ_MIN_LMAX.
We recommend upgrading past commit 3037933448f60f9acb705997eae62013ecb81e0d.
{
"affected": [],
"aliases": [
"CVE-2023-2248"
],
"database_specific": {
"cwe_ids": [
"CWE-787"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-05-01T13:15:44Z",
"severity": null
},
"details": "A heap out-of-bounds read/write vulnerability in the Linux Kernel traffic control (QoS) subsystem can be exploited to achieve local privilege escalation.\n\nThe\u00a0qfq_change_class function does not properly limit the lmax variable which can lead to out-of-bounds read/write.\u00a0If the TCA_QFQ_LMAX value is not offered through nlattr, lmax is determined by the MTU value of the network device. The MTU of the loopback device can be set up to 2^31-1 and as a result, it is possible to have an lmax value that exceeds QFQ_MIN_LMAX.\n\nWe recommend upgrading past commit 3037933448f60f9acb705997eae62013ecb81e0d.\n\n",
"id": "GHSA-jrgc-m5wf-7pch",
"modified": "2023-07-06T19:24:19Z",
"published": "2023-07-06T19:24:19Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-2248"
},
{
"type": "WEB",
"url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3037933448f60f9acb705997eae62013ecb81e0d"
},
{
"type": "WEB",
"url": "https://kernel.dance/3037933448f60f9acb705997eae62013ecb81e0d"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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