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CVE-2023-4623

CVSS v3.1 7.8 (High)
78% Progress
EPSS 0.04 % (5th)
0.04% Progress
Affected Products 2
Advisories 81
NVD Status Analyzed
Info CVSS EPSS Affected Configurations References Security Advisories Packages & Software Tools, Exploits & PoC Graph Web & Social Timeline

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.

Weaknesses
CWE-416
Use After Free
CVE Status
PUBLISHED
NVD Status
Analyzed
CNA
Google Inc.
Published Date
2023-09-06 14:15:12
(12 months ago)
Updated Date
2024-08-26 16:07:04
(3 weeks ago)

Affected Products

Debian

Linux

Configuration #1

    CPE23 From Up To
  Linux Kernel from 2.6.12 version and prior 4.14.327 version cpe:2.3:o:linux:linux_kernel >= 2.6.12 < 4.14.327
  Linux Kernel from 4.15 version and prior 4.19.295 version cpe:2.3:o:linux:linux_kernel >= 4.15 < 4.19.295
  Linux Kernel from 4.20 version and prior 5.4.257 version cpe:2.3:o:linux:linux_kernel >= 4.20 < 5.4.257
  Linux Kernel from 5.5 version and prior 5.10.195 version cpe:2.3:o:linux:linux_kernel >= 5.5 < 5.10.195
  Linux Kernel from 5.11 version and prior 5.15.132 version cpe:2.3:o:linux:linux_kernel >= 5.11 < 5.15.132
  Linux Kernel from 5.16 version and prior 6.1.53 version cpe:2.3:o:linux:linux_kernel >= 5.16 < 6.1.53
  Linux Kernel from 6.2 version and prior 6.4.16 version cpe:2.3:o:linux:linux_kernel >= 6.2 < 6.4.16
  Linux Kernel from 6.5 version and prior 6.5.3 version cpe:2.3:o:linux:linux_kernel >= 6.5 < 6.5.3

Configuration #2

    CPE23 From Up To
  Debian Linux 10.0 cpe:2.3:o:debian:debian_linux:10.0