{"id":"CVE-2025-37915","revision":"1d1968d032024f84ac960d5643d27cd7","records":[{"revision":"1d1968d032024f84ac960d5643d27cd7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-37915","aliases":[],"title":"net_sched: drr: Fix double list add in class with netem as child qdisc","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: drr: Fix double list add in class with netem as child qdisc\n\nAs described in Gerrard's report [1], there are use cases where a netem\nchild qdisc will make the parent qdisc's enqueue callback reentrant.\nIn the case of drr, there won't be a UAF, but the code will add the same\nclassifier to the list twice, which will cause memory corruption.\n\nIn addition to checking for qlen being zero, this patch checks whether the\nclass was already added to the active_list (cl_is_active) before adding\nto the list to cover for the reentrant case.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/","state":0,"publishedAt":"2025-05-20T15:21:46.44+00:00","modifiedAt":"2026-10-15T21:52:03.44+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_drr.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n                            \"lessThan\": \"5da3aad1a13e7edb8ff0778a444ccf49930313e9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n                            \"lessThan\": \"4b07ac06b0a712923255aaf2691637693fc7100d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n                            \"lessThan\": \"2968632880f1792007eedd12eeedf7f6e2b7e9f3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n                            \"lessThan\": \"4f0ecf50cdf76da95828578a92f130b653ac2fcf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n                            \"lessThan\": \"db205b92dfe0501e5b92fb7cf00971d0e44ba3eb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n                            \"lessThan\": \"26e75716b94d6ff9be5ea07d63675c4d189f30b4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n                            \"lessThan\": \"ab2248110738d4429668140ad22f530a9ee730e1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea\",\n                            \"lessThan\": \"f99a3fbf023e20b626be4b0f042463d598050c9a\",\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_drr.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\": \"5.4.294\",\n                            \"lessThanOrEqual\": \"5.4.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.238\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.182\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.138\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.90\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.28\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.14.6\",\n                            \"lessThanOrEqual\": \"6.14.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.15\",\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/5da3aad1a13e7edb8ff0778a444ccf49930313e9","https://git.kernel.org/stable/c/4b07ac06b0a712923255aaf2691637693fc7100d","https://git.kernel.org/stable/c/2968632880f1792007eedd12eeedf7f6e2b7e9f3","https://git.kernel.org/stable/c/4f0ecf50cdf76da95828578a92f130b653ac2fcf","https://git.kernel.org/stable/c/db205b92dfe0501e5b92fb7cf00971d0e44ba3eb","https://git.kernel.org/stable/c/26e75716b94d6ff9be5ea07d63675c4d189f30b4","https://git.kernel.org/stable/c/ab2248110738d4429668140ad22f530a9ee730e1","https://git.kernel.org/stable/c/f99a3fbf023e20b626be4b0f042463d598050c9a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-37915","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-37915","identifiers":["CVE-2025-37915"]},"retained":false,"historicalAffected":[]}],"coverage":[]}