{"id":"CVE-2026-22999","revision":"0b1f5cfd77b74462abc0883fe1ece22a","records":[{"revision":"0b1f5cfd77b74462abc0883fe1ece22a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-22999","aliases":[],"title":"net/sched: sch_qfq: do not free existing class in qfq_change_class()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: do not free existing class in qfq_change_class()\n\nFixes qfq_change_class() error case.\n\ncl->qdisc and cl should only be freed if a new class and qdisc\nwere allocated, or we risk various UAF.","state":0,"publishedAt":"2026-01-25T14:36:13.909+00:00","modifiedAt":"2026-10-19T18:25:27.014+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/sch_qfq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\",\n                            \"lessThan\": \"2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\",\n                            \"lessThan\": \"cff6cd703f41d8071995956142729e4bba160363\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\",\n                            \"lessThan\": \"f06f7635499bc806cbe2bbc8805c7cef8b1edddf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\",\n                            \"lessThan\": \"0a234660dc70ce45d771cbc76b20d925b73ec160\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\",\n                            \"lessThan\": \"362e269bb03f7076ba9990e518aeddb898232e50\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\",\n                            \"lessThan\": \"e9d8f11652fa08c647bf7bba7dd8163241a332cd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"462dbc9101acd38e92eda93c0726857517a24bbd\",\n                            \"lessThan\": \"3879cffd9d07aa0377c4b8835c4f64b4fb24ac78\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/sch_qfq.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.249\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.199\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.162\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.122\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.67\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.7\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e","https://git.kernel.org/stable/c/cff6cd703f41d8071995956142729e4bba160363","https://git.kernel.org/stable/c/f06f7635499bc806cbe2bbc8805c7cef8b1edddf","https://git.kernel.org/stable/c/0a234660dc70ce45d771cbc76b20d925b73ec160","https://git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50","https://git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd","https://git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-22999","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-22999","identifiers":["CVE-2026-22999"]},"retained":false,"historicalAffected":[]}],"coverage":[]}