CVE-2023-52609
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.
Does this matter?
Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own.
Description
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
- 4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.18% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linux/linux kernel · debian/debian linux
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/252a2a5569eb9f8d16428872cc24dea1ac0bb097Mailing List, Patch
- https://git.kernel.org/stable/c/6696f76c32ff67fec26823fc2df46498e70d9bf3Mailing List, Patch
- https://git.kernel.org/stable/c/67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3eMailing List, Patch
- https://git.kernel.org/stable/c/77d210e8db4d61d43b2d16df66b1ec46fad2ee01Mailing List, Patch
- https://git.kernel.org/stable/c/7e7a0d86542b0ea903006d3f42f33c4f7ead6918Mailing List, Patch
- https://git.kernel.org/stable/c/95b1d336b0642198b56836b89908d07b9a0c9608Mailing List, Patch
- https://git.kernel.org/stable/c/98fee5bee97ad47b527a997d5786410430d1f0e9Mailing List, Patch
- https://git.kernel.org/stable/c/9a9ab0d963621d9d12199df9817e66982582d5a5Mailing List, Patch
- https://git.kernel.org/stable/c/252a2a5569eb9f8d16428872cc24dea1ac0bb097Mailing List, Patch
- https://git.kernel.org/stable/c/6696f76c32ff67fec26823fc2df46498e70d9bf3Mailing List, Patch
- https://git.kernel.org/stable/c/67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3eMailing List, Patch
- https://git.kernel.org/stable/c/77d210e8db4d61d43b2d16df66b1ec46fad2ee01Mailing List, Patch
- https://git.kernel.org/stable/c/7e7a0d86542b0ea903006d3f42f33c4f7ead6918Mailing List, Patch
- https://git.kernel.org/stable/c/95b1d336b0642198b56836b89908d07b9a0c9608Mailing List, Patch
- https://git.kernel.org/stable/c/98fee5bee97ad47b527a997d5786410430d1f0e9Mailing List, Patch
- https://git.kernel.org/stable/c/9a9ab0d963621d9d12199df9817e66982582d5a5Mailing List, Patch
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.htmlMailing List
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlMailing List
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.