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CVE-2023-52609 Detail

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.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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Hyperlink Resource
https://git.kernel.org/stable/c/252a2a5569eb9f8d16428872cc24dea1ac0bb097
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/7e7a0d86542b0ea903006d3f42f33c4f7ead6918
https://git.kernel.org/stable/c/95b1d336b0642198b56836b89908d07b9a0c9608
https://git.kernel.org/stable/c/98fee5bee97ad47b527a997d5786410430d1f0e9
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

Weakness Enumeration

CWE-ID CWE Name Source

Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2023-52609
NVD Published Date:
03/18/2024
NVD Last Modified:
06/27/2024
Source:
kernel.org