Tracker / CVE-2023-4921
CVE-2023-4921
High 7.8
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.
Affected products and versions
| debian | debian_linux |
|---|---|
| linux | linux_kernel · 3.8 → 4.14.326 |
| linux | linux_kernel · 4.15 → 4.19.295 |
| linux | linux_kernel · 4.20 → 5.4.257 |
| linux | linux_kernel · 5.11 → 5.15.132 |
| linux | linux_kernel · 5.16 → 6.1.54 |
| linux | linux_kernel · 5.5 → 5.10.195 |
| linux | linux_kernel · 6.2 → 6.5.4 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.