{"id":"CVE-2026-93137","revision":"1dfd43386f6e475589adc2d9c187850e","records":[{"revision":"1dfd43386f6e475589adc2d9c187850e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93137","aliases":[],"title":"bpf: Fix use-after-free on mm_struct in bpf_find_vma()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix use-after-free on mm_struct in bpf_find_vma()\n\nbpf_find_vma() reads task->mm and calls mmap_read_trylock(mm) without\nholding a reference on the mm. On a foreign task, a concurrent exit_mm()\ncan free the mm_struct between the lockless read and the trylock,\nresulting in a use-after-free. mm_struct is not SLAB_TYPESAFE_BY_RCU.\n\nFor the current task, task->mm is stable. For a foreign task, pin the mm\nunder task->alloc_lock and release it with mmput_async(), mirroring commit\nd8e27d2d22b6 (\"bpf: fix mm lifecycle in open-coded task_vma iterator\").\nUse spin_trylock() instead of get_task_mm() so BPF context does not block\non alloc_lock. Reject irqs-disabled contexts and !CONFIG_MMU on the\nforeign-task path because dropping the mm reference is not safe there.\n\nRace:\n\n  CPU0 (BPF program)                  CPU1 (exiting task)\n  ============================        ==========================\n  bpf_find_vma(foreign_task):\n    mm = task->mm\n                                      exit_mm():\n                                        task->mm = NULL\n                                        mmput(mm) -> frees mm_struct\n    mmap_read_trylock(mm)\n        // UAF on mm","state":0,"publishedAt":"2026-09-17T16:11:38.135+00:00","modifiedAt":"2026-10-19T09:06:10.069+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/bpf/task_iter.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\n                            \"lessThan\": \"db347840d6b6ee9bb9b8e4a985d4b4419f9f3200\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\n                            \"lessThan\": \"8e1101fc4118019a69c96ced4aec93164f89cbd5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\n                            \"lessThan\": \"c7ad910e987008e125eeff448892e86852173384\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\n                            \"lessThan\": \"86d54cf069fc5ae2e111c87933bebf6eb527978e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\n                            \"lessThan\": \"2b2a903bee56d312539046d9defa8023eec94760\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c7e3d31e7856a8260a254f8c71db416f7f9f5a1\",\n                            \"lessThan\": \"47b079e2117a2ee52e21f8b72935900c702fc0b5\",\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/bpf/task_iter.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\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\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":[{"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/db347840d6b6ee9bb9b8e4a985d4b4419f9f3200","https://git.kernel.org/stable/c/8e1101fc4118019a69c96ced4aec93164f89cbd5","https://git.kernel.org/stable/c/c7ad910e987008e125eeff448892e86852173384","https://git.kernel.org/stable/c/86d54cf069fc5ae2e111c87933bebf6eb527978e","https://git.kernel.org/stable/c/2b2a903bee56d312539046d9defa8023eec94760","https://git.kernel.org/stable/c/47b079e2117a2ee52e21f8b72935900c702fc0b5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93137","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93137","identifiers":["CVE-2026-93137"]},"retained":false,"historicalAffected":[]}],"coverage":[]}