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CVE-2023-4921 Detail

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.


Metrics

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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8fc134fee27f2263988ae38920bc03da416b03d8 Exploit  Mailing List  Patch  Vendor Advisory 
https://kernel.dance/8fc134fee27f2263988ae38920bc03da416b03d8 Exploit  Patch  Vendor Advisory 
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html Mailing List  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html Mailing List  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST   Google Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2023-4921
NVD Published Date:
09/12/2023
NVD Last Modified:
08/26/2024
Source:
Google Inc.