CVE-2023-4921
Severity
7.8HIGH
EPSS
0.0%
top 97.79%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedSep 12
Latest updateMar 18
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9
Affected Packages3 packages
Also affects: Debian Linux 10.0
Patches
🔴Vulnerability Details
5OSV▶
CVE-2023-4921: A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation↗2023-09-12
GHSA▶
GHSA-qw4m-2pv2-7r5f: A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation↗2023-09-12