CVE-2023-4623
High
Description
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedSep 6, 2023
First seenSep 6, 2023
Weakness typeCWE-416Use after free
How to fix
Update
- linux linux_kernel4.14.327, 4.19.295, 5.4.257, 5.10.195, 5.15.132, 6.1.53, 6.4.16, 6.5.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.12 ≤ v < 4.14.327, 4.15 ≤ v < 4.19.295, 4.20 ≤ v < 5.4.257, 5.5 ≤ v < 5.10.195, 5.11 ≤ v < 5.15.132, 5.16 ≤ v < 6.1.53, 6.2 ≤ v < 6.4.16, 6.5 ≤ v < 6.5.3 | 4.14.327, 4.19.295, 5.4.257, 5.10.195, 5.15.132, 6.1.53, 6.4.16, 6.5.3 |
| debian debian_linux | 10.0 | — |
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