It was discovered that the cls_route filter implementation in the Linux kernel would not remove an old filter from the hashtable before freeing it if its handle had the value 0.

{
                    "packageName": "linux",
                    "product": "linux",
                    "vendor": "The Linux Kernel Organization",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git",
                    "platforms": [
                        "Linux"
                    ],
                    "versions": [
                        {
                            "lessThan": "6.0~rc1",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        }
                    ]
                }