CVE-2023-52609 (GCVE-0-2023-52609)
Vulnerability from cvelistv5
Published
2024-03-18 10:07
Modified
2025-05-04 07:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: binder: fix race between mmput() and do_exit() Task A calls binder_update_page_range() to allocate and insert pages on a remote address space from Task B. For this, Task A pins the remote mm via mmget_not_zero() first. This can race with Task B do_exit() and the final mmput() refcount decrement will come from Task A. Task A | Task B ------------------+------------------ mmget_not_zero() | | do_exit() | exit_mm() | mmput() mmput() | exit_mmap() | remove_vma() | fput() | In this case, the work of ____fput() from Task B is queued up in Task A as TWA_RESUME. So in theory, Task A returns to userspace and the cleanup work gets executed. However, Task A instead sleep, waiting for a reply from Task B that never comes (it's dead). This means the binder_deferred_release() is blocked until an unrelated binder event forces Task A to go back to userspace. All the associated death notifications will also be delayed until then. In order to fix this use mmput_async() that will schedule the work in the corresponding mm->async_put_work WQ instead of Task A.
References
Impacted products
Vendor Product Version
Linux Linux Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
Version: 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7
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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\u0027s 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-\u003easync_put_work WQ instead of Task A.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.306\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.268\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.209\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.148\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.75\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.14\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.2\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"2.6.29\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:39:48.513Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52609\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:39:48.513Z\", \"dateReserved\": \"2024-03-06T09:52:12.088Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-18T10:07:45.486Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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