CVEvulnerability

CVE-2023-4623

7.8 HIGH Published 2023-09-06 Modified 2026-10-14 Official page ↗
Status
Modified
Published
2023-09-06
Last modified
2026-10-14
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-416

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.

Affected configurations

• linux linux kernel (>= 2.6.12 < 4.14.327) • linux linux kernel (>= 4.15 < 4.19.295) • linux linux kernel (>= 4.20 < 5.4.257) • linux linux kernel (>= 5.5 < 5.10.195) • linux linux kernel (>= 5.11 < 5.15.132) • linux linux kernel (>= 5.16 < 6.1.53) • linux linux kernel (>= 6.2 < 6.4.16) • linux linux kernel (>= 6.5 < 6.5.3) • debian debian linux 10.0

Related

Weakness · CWE (1)

References