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Test your applicationsUpgrade SLES:15.3 kernel-macros to version 5.3.18-150300.59.218.1 or higher.
Note: Versions mentioned in the description apply only to the upstream kernel-macros package and not the kernel-macros package as distributed by SLES.
See How to fix? for SLES:15.3 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net/sched: sch_qfq: Fix race condition on qfq_aggregate
A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free.
This patch addresses the issue by:
Moved qfq_destroy_class into the critical section.
Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.