CVE-2024-53164

In the Linux kernel, the following vulnerability has been resolved:

net: sched: fix ordering of qlen adjustment

Changes to sch->q.qlen around qdisc_tree_reduce_backlog() need to happen before a call to said function because otherwise it may fail to notify parent qdiscs when the child is about to become empty.

The bug is in Common Applications Kept Enhanced (CAKE) queue management algorithm. The support of this algorithm enabled starting from Red Hat Enterprise Linux 9.2. It is disabled by default (can be enabled by tc qdisc cake command). The security impact of this issue is limited.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent module sch_cake from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.