{"id":"CVE-2023-52609","state":"PUBLISHED","title":"binder: fix race between mmput() and do_exit()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix race between mmput() and do_exit()\n\nTask A calls binder_update_page_range() to allocate and insert pages on\na remote address space from Task B. For this, Task A pins the remote mm\nvia mmget_not_zero() first. This can race with Task B do_exit() and the\nfinal mmput() refcount decrement will come from Task A.\n\n  Task A            | Task B\n  ------------------+------------------\n  mmget_not_zero()  |\n                    |  do_exit()\n                    |    exit_mm()\n                    |      mmput()\n  mmput()           |\n    exit_mmap()     |\n      remove_vma()  |\n        fput()      |\n\nIn this case, the work of ____fput() from Task B is queued up in Task A\nas TWA_RESUME. So in theory, Task A returns to userspace and the cleanup\nwork gets executed. However, Task A instead sleep, waiting for a reply\nfrom Task B that never comes (it's dead).\n\nThis means the binder_deferred_release() is blocked until an unrelated\nbinder event forces Task A to go back to userspace. All the associated\ndeath notifications will also be delayed until then.\n\nIn order to fix this use mmput_async() that will schedule the work in\nthe corresponding mm->async_put_work WQ instead of Task A.","publishedAt":"2024-03-18T10:07:45.486Z","updatedAt":"2026-05-11T19:30:17.511Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"457b9a6f09f011ebcb9b52cc203a6331a6fc2de7","status":"affected","lessThan":"95b1d336b0642198b56836b89908d07b9a0c9608","versionType":"git"},{"version":"457b9a6f09f011ebcb9b52cc203a6331a6fc2de7","status":"affected","lessThan":"252a2a5569eb9f8d16428872cc24dea1ac0bb097","versionType":"git"},{"version":"457b9a6f09f011ebcb9b52cc203a6331a6fc2de7","status":"affected","lessThan":"7e7a0d86542b0ea903006d3f42f33c4f7ead6918","versionType":"git"},{"version":"457b9a6f09f011ebcb9b52cc203a6331a6fc2de7","status":"affected","lessThan":"98fee5bee97ad47b527a997d5786410430d1f0e9","versionType":"git"},{"version":"457b9a6f09f011ebcb9b52cc203a6331a6fc2de7","status":"affected","lessThan":"6696f76c32ff67fec26823fc2df46498e70d9bf3","versionType":"git"},{"version":"457b9a6f09f011ebcb9b52cc203a6331a6fc2de7","status":"affected","lessThan":"67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3e","versionType":"git"},{"version":"457b9a6f09f011ebcb9b52cc203a6331a6fc2de7","status":"affected","lessThan":"77d210e8db4d61d43b2d16df66b1ec46fad2ee01","versionType":"git"},{"version":"457b9a6f09f011ebcb9b52cc203a6331a6fc2de7","status":"affected","lessThan":"9a9ab0d963621d9d12199df9817e66982582d5a5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/android/binder_alloc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.29","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.29","versionType":"semver"},{"version":"4.19.306","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.268","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.209","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.148","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.75","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.14","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.2","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/android/binder_alloc.c"]}],"references":["https://git.kernel.org/stable/c/95b1d336b0642198b56836b89908d07b9a0c9608","https://git.kernel.org/stable/c/252a2a5569eb9f8d16428872cc24dea1ac0bb097","https://git.kernel.org/stable/c/7e7a0d86542b0ea903006d3f42f33c4f7ead6918","https://git.kernel.org/stable/c/98fee5bee97ad47b527a997d5786410430d1f0e9","https://git.kernel.org/stable/c/6696f76c32ff67fec26823fc2df46498e70d9bf3","https://git.kernel.org/stable/c/67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3e","https://git.kernel.org/stable/c/77d210e8db4d61d43b2d16df66b1ec46fad2ee01","https://git.kernel.org/stable/c/9a9ab0d963621d9d12199df9817e66982582d5a5","https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html","https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52609.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52609","state":"PUBLISHED","datePublished":"2024-03-18T10:07:45.486Z","dateUpdated":"2026-05-11T19:30:17.511Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-03-06T09:52:12.088Z"},"containers":{"cna":{"title":"binder: fix race between mmput() and do_exit()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix race between mmput() and do_exit()\n\nTask A calls binder_update_page_range() to allocate and insert pages on\na remote address space from Task B. For this, Task A pins the remote mm\nvia mmget_not_zero() first. This can race with Task B do_exit() and the\nfinal mmput() refcount decrement will come from Task A.\n\n  Task A            | Task B\n  ------------------+------------------\n  mmget_not_zero()  |\n                    |  do_exit()\n                    |    exit_mm()\n                    |      mmput()\n  mmput()           |\n    exit_mmap()     |\n      remove_vma()  |\n        fput()      |\n\nIn this case, the work of ____fput() from Task B is queued up in Task A\nas TWA_RESUME. So in theory, Task A returns to userspace and the cleanup\nwork gets executed. However, Task A instead sleep, waiting for a reply\nfrom Task B that never comes (it's dead).\n\nThis means the binder_deferred_release() is blocked until an unrelated\nbinder event forces Task A to go back to userspace. All the associated\ndeath notifications will also be delayed until then.\n\nIn order to fix this use mmput_async() that will schedule the work in\nthe corresponding mm->async_put_work WQ instead of Task 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