CVSS 4.7 · Medium EPSS 0,19%
Kerentanan Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') pada linux kernel, debian linux. Skor CVSS 3.1 4.7 (Medium) menurut NVD.
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.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 2.6.29 hingga sebelum 4.19.306 |
| linux | linux kernel | Versi 4.20 hingga sebelum 5.4.268 |
| linux | linux kernel | Versi 5.5 hingga sebelum 5.10.209 |
| linux | linux kernel | Versi 5.11 hingga sebelum 5.15.148 |
| linux | linux kernel | Versi 5.16 hingga sebelum 6.1.75 |
| linux | linux kernel | Versi 6.2 hingga sebelum 6.6.14 |
| linux | linux kernel | Versi 6.7 hingga sebelum 6.7.2 |
| debian | debian linux | Versi 10.0 |