High · published September 13, 2023
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.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 3.8, < 4.14.326 | 4.14.326 |
| linux/linux_kernel | ≥ 4.15, < 4.19.295 | 4.19.295 |
| linux/linux_kernel | ≥ 4.20, < 5.4.257 | 5.4.257 |
| linux/linux_kernel | ≥ 5.5, < 5.10.195 | 5.10.195 |
| linux/linux_kernel | ≥ 5.11, < 5.15.132 | 5.15.132 |
| linux/linux_kernel | ≥ 5.16, < 6.1.54 | 6.1.54 |
| linux/linux_kernel | ≥ 6.2, < 6.5.4 | 6.5.4 |
| debian/debian_linux | all versions | — |