GHSA-WJW6-9W8Q-RVJV
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 15:31In the Linux kernel, the following vulnerability has been resolved:
net/sched: defer qdisc freeing after failed creation
An RTM_NEWQDISC request can make clsact bind a populated shared ingress block during ->init(), publishing an embedded mini_Qdisc to lockless readers. If the same request has an invalid TCA_RATE, estimator setup fails after ->init(); the unwind removes the pointer but synchronously frees its containing qdisc while tc_run() may still hold it.
Retire failed qdiscs through the same RCU helper as normal destruction. Inline the synchronous free into the callback now that no direct callers remain.
{
"affected": [],
"aliases": [
"CVE-2026-98017"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:30Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: defer qdisc freeing after failed creation\n\nAn RTM_NEWQDISC request can make clsact bind a populated shared ingress\nblock during -\u003einit(), publishing an embedded mini_Qdisc to lockless\nreaders. If the same request has an invalid TCA_RATE, estimator setup\nfails after -\u003einit(); the unwind removes the pointer but synchronously\nfrees its containing qdisc while tc_run() may still hold it.\n\nRetire failed qdiscs through the same RCU helper as normal destruction.\nInline the synchronous free into the callback now that no direct callers\nremain.",
"id": "GHSA-wjw6-9w8q-rvjv",
"modified": "2026-09-25T15:31:44Z",
"published": "2026-09-25T12:31:33Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98017"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/156a3bab69744e9225bb9eff8c5cc53da18d5a2e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/20bf6fa34b345333971bd4464a322cce87b83f4e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5bfe927c5b4b290fad529186218c728589b4b101"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e6662f2100f8d33b0f4d0047c219efd6bba186ea"
}
],
"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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