CVE-2023-4206

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Source
https://cve.org/CVERecord?id=CVE-2023-4206
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-4206.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2023-4206
Downstream
Related
Published
2023-09-06T13:53:05.197Z
Modified
2026-05-08T04:52:32.478009Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Use-after-free in Linux kernel's net/sched: cls_route component
Details

A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation.

When route4change() is called on an existing filter, the whole tcfresult struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcfunbindfilter() 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.

Database specific 
{
    "cna_assigner": "Google",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/4xxx/CVE-2023-4206.json",
    "cwe_ids": [
        "CWE-416"
    ]
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Events
Introduced
b2776bf7149bddd1f4161f14f79520f17fc1d71d
Fixed
2dde18cd1d8fac735875f2e4987f11817cc0bc2c
Database specific 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "3.18"
        },
        {
            "fixed": "6.5"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-4206.json"