CVE-2023-3776

Summary

CVE-2023-3776 is a use-after-free vulnerability affecting the Linux kernel's net/sched: cls_fw component. When tcf_change_indev() fails, fw_set_parms() does not properly handle the reference counter, allowing attackers to manipulate it and cause a reference to be freed. Subsequently, the freed memory can be used after it has been deallocated, resulting in local privilege escalation. To mitigate this issue, it is advised to upgrade to a kernel version past commit 0323bce598eea038714f941ce2b22541c46d488f.

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