CVE-2023-4623

CVSS V2 None CVSS V3 None

Description

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.

Overview

CVE ID
CVE-2023-4623

Assigner
Google

Vulnerability Status
PUBLISHED

Published Version
2023-09-06T13:56:57.295Z

Last Modified Date
2023-09-06T13:56:57.295Z

Weakness Enumerations

CWE	URL
CWE-416	http://cwe.mitre.org/data/definitions/416.html

References

Reference URL	Reference Tags
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3d26c5702c7d6c45456326e56d2ccf3f103e60f	patch
https://kernel.dance/b3d26c5702c7d6c45456326e56d2ccf3f103e60f
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2023-4623
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4623

History

Created	Old Value	New Value	Data Type	Notes
2024-06-24 19:45:57				Added to TrackCVE