CVE-2023-4623

A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation. If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free. We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.

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
http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3d26c5702c7d6c45456326e56d2ccf3f103e60f	Issue Tracking Mailing List Patch Vendor Advisory
https://kernel.dance/b3d26c5702c7d6c45456326e56d2ccf3f103e60f	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 : 2023-09-06 14:15

Updated : 2024-01-11 19:15

NVD link : CVE-2023-4623

Mitre link : CVE-2023-4623

CVE.ORG link : CVE-2023-4623

JSON object : View

Products Affected

debian

debian_linux

linux

linux_kernel

CWE

CWE-416

Use After Free

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