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CVE-2023-4921

CVSS v3.1 7.8 (High)
78% Progress
EPSS 0.04 % (5th)
0.04% Progress
Affected Products 2
Advisories 67
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_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.

Weaknesses
CWE-416
Use After Free
CVE Status
PUBLISHED
NVD Status
Analyzed
CNA
Google Inc.
Published Date
2023-09-12 20:15:10
(12 months ago)
Updated Date
2024-08-26 16:06:55
(3 weeks ago)

Affected Products

Debian

Linux

Configuration #1

    CPE23 From Up To
  Linux Kernel from 3.8 version and prior 4.14.326 version cpe:2.3:o:linux:linux_kernel >= 3.8 < 4.14.326
  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 6.1.54 version cpe:2.3:o:linux:linux_kernel >= 5.16 < 6.1.54
  Linux Kernel from 6.2 version and prior 6.5.4 version cpe:2.3:o:linux:linux_kernel >= 6.2 < 6.5.4

Configuration #2

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