Tracker / CVE-2023-4623
CVE-2023-4623
High 7.8
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 products and versions
| debian | debian_linux |
|---|---|
| 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 · 5.11 → 5.15.132 |
| linux | linux_kernel · 5.16 → 6.1.53 |
| linux | linux_kernel · 5.5 → 5.10.195 |
| linux | linux_kernel · 6.2 → 6.4.16 |
| linux | linux_kernel · 6.5 → 6.5.3 |
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.