CVE-2023-4921

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.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	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

Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2023-09-12 20:15

Updated : 2024-01-11 19:15

NVD link : CVE-2023-4921

Mitre link : CVE-2023-4921

CVE.ORG link : CVE-2023-4921

JSON object : View

Products Affected

debian

debian_linux

linux

linux_kernel

CWE

CWE-416

Use After Free

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