VULNERABILITY INTELLIGENCE
CVE-2023-4921
CVSS score7.8 HIGH
EPSS probability0.42%
CISA KEVNot currently listed
Published2023-09-12
Last modified2026-10-14
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Description
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 qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue(). We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.
Weakness classification
- cve-coordination@google.com: CWE-416
- nvd@nist.gov: CWE-416
Primary references
- cve-coordination@google.com — Exploit, Mailing List, Patch, Vendor Advisory
- cve-coordination@google.com — Exploit, Patch, Vendor Advisory
- cve-coordination@google.com — Mailing List, Third Party Advisory
- cve-coordination@google.com — Mailing List, Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Exploit, Mailing List, Patch, Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Exploit, Patch, Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e