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Test your applicationsUpgrade RHEL:7
kernel-rt-debug
to version 0:3.10.0-1160.105.1.rt56.1256.el7 or higher.
This issue was patched in RHSA-2023:7424
.
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug
package and not the kernel-rt-debug
package as distributed by RHEL
.
See How to fix?
for RHEL:7
relevant fixed versions and status.
A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.
When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.
We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.