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Test your applicationsUpgrade Rocky-Linux:9 kernel-rt to version 0:5.14.0-570.30.1.el9_6 or higher.
This issue was patched in RLSA-2025:11861.
Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by Rocky-Linux.
See How to fix? for Rocky-Linux:9 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net_sched: hfsc: Fix a UAF vulnerability in class handling
This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-use condition in hfsc_change_class() when working with certain child qdiscs like netem or codel.
The vulnerability works as follows:
The fix adds a second queue length check after qdisc_peek_len() to verify the queue wasn't emptied.