{"id":"CVE-2026-98864","revision":"a6c782b878ed4069b0a332d5b196092b","records":[{"revision":"a6c782b878ed4069b0a332d5b196092b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98864","aliases":[],"title":"sched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Wait for SCX_OPSS_DISPATCHING before reenqueueing a task\n\nebf1ccff79c4 (\"sched_ext: Fix ops.dequeue() semantics\") moved the final\nops_state store in scx_dispatch_enqueue() after the DSQ unlock so that the\ncustody update and ops.dequeue() precede it. A task can thus be found on a\nDSQ while still SCX_OPSS_DISPATCHING.\n\nThe dequeue and core-sched pick paths wait for the state to clear in\nops_dequeue() but the reenqueue paths don't. A reenqueue in that window runs\nops.enqueue() and sets SCX_OPSS_QUEUED before the dispatch has completed.\nThe dispatcher's final store then overwrites it with SCX_OPSS_NONE and\nfinish_dispatch() drops every later dispatch of the task.\n\nWait for SCX_OPSS_DISPATCHING to clear before dequeueing a task for\nreenqueue, the same way ops_dequeue() does.","state":0,"publishedAt":"2026-10-18T15:51:25.532+00:00","modifiedAt":"2026-10-19T09:26:58.668+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                        \"kernel/sched/ext/ext.c\",\n                        \"kernel/sched/ext/internal.h\",\n                        \"kernel/sched/ext/sub.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d\",\n                            \"lessThan\": \"43457bf6550044c40bd6d3fcdf9ea66f5a55d139\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ebf1ccff79c43f860cbd2f9d6cfab9a462d0cb2d\",\n                            \"lessThan\": \"7de9a6fb44eae4f05e68c805d58b9c618815adfa\",\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                        \"kernel/sched/ext/ext.c\",\n                        \"kernel/sched/ext/internal.h\",\n                        \"kernel/sched/ext/sub.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7.1\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"7.1\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.10\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/43457bf6550044c40bd6d3fcdf9ea66f5a55d139","https://git.kernel.org/stable/c/7de9a6fb44eae4f05e68c805d58b9c618815adfa"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98864","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98864","identifiers":["CVE-2026-98864"]},"retained":false,"historicalAffected":[]}],"coverage":[]}