CVE-2023-4921

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Source
https://cve.org/CVERecord?id=CVE-2023-4921
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-4921.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2023-4921
Downstream
Related
Published
2023-09-12T20:15:10.573Z
Modified
2026-03-15T22:47:41.133279Z
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_qfq component can be exploited to achieve local privilege escalation.

When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfqdequeue() due to the incorrect .peek handler of schplug and lack of error checking in agg_dequeue().

We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.

References

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "3.8"
            },
            {
                "fixed": "4.14.326"
            }
        ]
    },
    {
        "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": "6.1.54"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "6.2"
            },
            {
                "fixed": "6.5.4"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "10.0"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-4921.json"