CVE-2023-4921

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Source
https://nvd.nist.gov/vuln/detail/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
2023-09-12T20:15:10Z
Modified
2025-08-09T19:01:28Z
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