CVE-2023-4921
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedSep 12, 2023
First seenSep 12, 2023
Weakness typeCWE-416Use after free
How to fix
Update
- linux linux_kernel4.14.326, 4.19.295, 5.4.257, 5.10.195, 5.15.132, 6.1.54, 6.5.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 3.8 ≤ v < 4.14.326, 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 < 6.1.54, 6.2 ≤ v < 6.5.4 | 4.14.326, 4.19.295, 5.4.257, 5.10.195, 5.15.132, 6.1.54, 6.5.4 |
| debian debian_linux | 10.0 | — |
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