CVE-2023-2248 Information

Description

A heap out-of-bounds read/write vulnerability in the Linux Kernel traffic control (QoS) subsystem can be exploited to achieve local privilege escalation.

The qfq_change_class function does not properly limit the lmax variable which can lead to out-of-bounds read/write. If the TCA_QFQ_LMAX value is not offered through nlattr lmax is determined by the MTU value of the network device. The MTU of the loopback device can be set up to 2^31-1 and as a result it is possible to have an lmax value that exceeds QFQ_MIN_LMAX.

We recommend upgrading past commit 3037933448f60f9acb705997eae62013ecb81e0d.

Reference

https://kernel.dance/3037933448f60f9acb705997eae62013ecb81e0d https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3037933448f60f9acb705997eae62013ecb81e0d