High
Use-after-free in Linux kernel's net/sched: cls_route component
Type: advisorySources: OSV
A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation. When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free. We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2023-4206
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 8 Nov 2026, 03:13 UTC · Revision 1
Source evidence
Use-after-free in Linux kernel's net/sched: cls_route component
core-osv · Original sourcePublished 6 Sept 2023, 13:53 UTC
A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation. When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free. We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8.
osv:CVE-2023-4206
Complete source record
{
"id": "e6e54bb933ad8fe0d152744d5cc0c8958226f998de857c6504ddb94c311686b3",
"url": "https://osv.dev/vulnerability/CVE-2023-4206",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Use-after-free in Linux kernel's net/sched: cls_route component",
"summary": "A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation. When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free. We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8.",
"evidence": "osv:CVE-2023-4206",
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"severity": "high",
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"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-4206.json"
}
}
],
"modified": "2026-10-28T02:30:53.327154301Z",
"provider": "osv",
"references": [
"https://git.kernel.org",
"https://kernel.dance/b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8",
"https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/4xxx/CVE-2023-4206.json",
"https://nvd.nist.gov/vuln/detail/CVE-2023-4206",
"https://www.debian.org/security/2023/dsa-5492",
"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8"
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"provider_metadata": {
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],
"cna_assigner": "Google",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/4xxx/CVE-2023-4206.json"
}
},
"related_cves": [
{
"value": "CVE-2023-4206",
"evidence": "/id"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 522111,
"published_at": "2023-09-06T13:53:05.197+00:00"
}