CVE-2023-4623

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Source
https://cve.org/CVERecord?id=CVE-2023-4623
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-4623.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2023-4623
Downstream
Related
Published
2023-09-06T14:15:12.357Z
Modified
2026-03-13T07:41:18.774315Z
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
[none]
Details

A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation.

If a class with a link-sharing curve (i.e. with the HFSCFSC flag set) has a parent without a link-sharing curve, then initvf() will call vttreeinsert() on the parent, but vttreeremove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free.

We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.

References

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "2.6.12"
            },
            {
                "fixed": "4.14.327"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.15"
            },
            {
                "fixed": "4.19.295"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.20"
            },
            {
                "fixed": "5.4.257"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.5"
            },
            {
                "fixed": "5.10.195"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.11"
            },
            {
                "fixed": "5.15.132"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.16"
            },
            {
                "fixed": "6.1.53"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "6.2"
            },
            {
                "fixed": "6.4.16"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "6.5"
            },
            {
                "fixed": "6.5.3"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "10.0"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-4623.json"