{"id":"CVE-2026-46173","revision":"a299300eb56740dfa91d5d93bf8b763a","records":[{"revision":"a299300eb56740dfa91d5d93bf8b763a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46173","aliases":[],"title":"exit: prevent preemption of oopsing TASK_DEAD task","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nexit: prevent preemption of oopsing TASK_DEAD task\n\nWhen an already-exiting task oopses, make_task_dead() currently calls\ndo_task_dead() with preemption enabled.  That is forbidden:\ndo_task_dead() calls __schedule(), which has a comment saying \"WARNING:\nmust be called with preemption disabled!\".\n\nIf an oopsing task is preempted in do_task_dead(), between becoming\nTASK_DEAD and entering the scheduler explicitly, bad things happen:\nfinish_task_switch() assumes that once the scheduler has switched away\nfrom a TASK_DEAD task, the task can never run again and its stack is no\nlonger needed; but that assumption apparently doesn't hold if the dead\ntask was preempted (the SM_PREEMPT case).\n\nThis means that the scheduler ends up repeatedly dropping references on\nthe dead task's stack, which can lead to use-after-free or double-free\nof the entire task stack; in other words, two tasks can end up running\non the same stack, resulting in various kinds of memory corruption.\n\n(This does not just affect \"recursively oopsing\" tasks; it is enough to\noops once during task exit, for example in a file_operations::release\nhandler)","state":0,"publishedAt":"2026-05-28T09:36:27.892+00:00","modifiedAt":"2026-10-19T19:36:53.446+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/exit.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7f80a2fd7db9a55894fd841915236aca611291b5\",\n                            \"lessThan\": \"3d6fb8a7690c23e3213c4b008f64d89a44b98737\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f80a2fd7db9a55894fd841915236aca611291b5\",\n                            \"lessThan\": \"640b4c00fb0e2920327435f6176cbefc3c546165\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f80a2fd7db9a55894fd841915236aca611291b5\",\n                            \"lessThan\": \"7b2800ba5f5f77a8ee7f4cbadb19cf1264597a34\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f80a2fd7db9a55894fd841915236aca611291b5\",\n                            \"lessThan\": \"6f49f94f3b11fe8bff1bf2a054143789e76aaf17\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f80a2fd7db9a55894fd841915236aca611291b5\",\n                            \"lessThan\": \"9756b3db5db6c2f5eccb32dddbd88eb4c54f575e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f80a2fd7db9a55894fd841915236aca611291b5\",\n                            \"lessThan\": \"c1fa0bb633e4a6b11e83ffc57fa5abe8ebb87891\",\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/exit.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.140\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.88\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.30\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.7\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\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/3d6fb8a7690c23e3213c4b008f64d89a44b98737","https://git.kernel.org/stable/c/640b4c00fb0e2920327435f6176cbefc3c546165","https://git.kernel.org/stable/c/7b2800ba5f5f77a8ee7f4cbadb19cf1264597a34","https://git.kernel.org/stable/c/6f49f94f3b11fe8bff1bf2a054143789e76aaf17","https://git.kernel.org/stable/c/9756b3db5db6c2f5eccb32dddbd88eb4c54f575e","https://git.kernel.org/stable/c/c1fa0bb633e4a6b11e83ffc57fa5abe8ebb87891","https://project-zero.issues.chromium.org/issues/510793286"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46173","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46173","identifiers":["CVE-2026-46173"]},"retained":false,"historicalAffected":[]}],"coverage":[]}