{"id":"CVE-2024-45016","revision":"521b8be993a24f92b3f1d8911f5854db","records":[{"revision":"521b8be993a24f92b3f1d8911f5854db","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2024-45016","aliases":[],"title":"netem: fix return value if duplicate enqueue fails","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetem: fix return value if duplicate enqueue fails\n\nThere is a bug in netem_enqueue() introduced by\ncommit 5845f706388a (\"net: netem: fix skb length BUG_ON in __skb_to_sgvec\")\nthat can lead to a use-after-free.\n\nThis commit made netem_enqueue() always return NET_XMIT_SUCCESS\nwhen a packet is duplicated, which can cause the parent qdisc's q.qlen\nto be mistakenly incremented. When this happens qlen_notify() may be\nskipped on the parent during destruction, leaving a dangling pointer\nfor some classful qdiscs like DRR.\n\nThere are two ways for the bug happen:\n\n- If the duplicated packet is dropped by rootq->enqueue() and then\n  the original packet is also dropped.\n- If rootq->enqueue() sends the duplicated packet to a different qdisc\n  and the original packet is dropped.\n\nIn both cases NET_XMIT_SUCCESS is returned even though no packets\nare enqueued at the netem qdisc.\n\nThe fix is to defer the enqueue of the duplicate packet until after\nthe original packet has been guaranteed to return NET_XMIT_SUCCESS.","state":0,"publishedAt":"2024-09-11T15:13:52.053+00:00","modifiedAt":"2026-10-15T00:50:01.01+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_netem.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5845f706388a4cde0f6b80f9e5d33527e942b7d9\",\n                            \"lessThan\": \"759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5845f706388a4cde0f6b80f9e5d33527e942b7d9\",\n                            \"lessThan\": \"c414000da1c2ea1ba9a5e5bb1a4ba774e51e202d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5845f706388a4cde0f6b80f9e5d33527e942b7d9\",\n                            \"lessThan\": \"52d99a69f3d556c6426048c9d481b912205919d8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5845f706388a4cde0f6b80f9e5d33527e942b7d9\",\n                            \"lessThan\": \"0486d31dd8198e22b63a4730244b38fffce6d469\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5845f706388a4cde0f6b80f9e5d33527e942b7d9\",\n                            \"lessThan\": \"577d6c0619467fe90f7e8e57e45cb5bd9d936014\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5845f706388a4cde0f6b80f9e5d33527e942b7d9\",\n                            \"lessThan\": \"e5bb2988a310667abed66c7d3ffa28880cf0f883\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5845f706388a4cde0f6b80f9e5d33527e942b7d9\",\n                            \"lessThan\": \"c07ff8592d57ed258afee5a5e04991a48dbaf382\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a550a01b8af856f2684b0f79d552f5119eb5006c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"009510a90e230bb495f3fe25c7db956679263b07\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4de7d30668cb8b06330992e1cd336f91700a2ce7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d1dd2e15c85e890a1cc9bde5ba07ae63331e5c73\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0148fe458b5705e2fea7cb88294fed7e36066ca2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3.16.66\",\n                            \"lessThan\": \"3.17\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.9.163\",\n                            \"lessThan\": \"4.10\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.14.106\",\n                            \"lessThan\": \"4.15\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.19.28\",\n                            \"lessThan\": \"4.20\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"4.20.15\",\n                            \"lessThan\": \"4.21\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\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_netem.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.4.283\",\n                            \"lessThanOrEqual\": \"5.4.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.225\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.166\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.107\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.48\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.10.7\",\n                            \"lessThanOrEqual\": \"6.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.11\",\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/759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4","https://git.kernel.org/stable/c/c414000da1c2ea1ba9a5e5bb1a4ba774e51e202d","https://git.kernel.org/stable/c/52d99a69f3d556c6426048c9d481b912205919d8","https://git.kernel.org/stable/c/0486d31dd8198e22b63a4730244b38fffce6d469","https://git.kernel.org/stable/c/577d6c0619467fe90f7e8e57e45cb5bd9d936014","https://git.kernel.org/stable/c/e5bb2988a310667abed66c7d3ffa28880cf0f883","https://git.kernel.org/stable/c/c07ff8592d57ed258afee5a5e04991a48dbaf382"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2024-45016","license":"CVE Program Terms of Use","key":"cve-program:CVE-2024-45016","identifiers":["CVE-2024-45016"]},"retained":false,"historicalAffected":[]}],"coverage":[]}