cbcvebase.
CVE-2023-52609
published 2024-03-18

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…

PriorityP416medium4.7CVSS 3.1
AVLACHPRLUINSUCNINAH
EPSS
0.18%
8.3th percentile
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.

Affected

24 ranges
VendorProductVersion rangeFixed in
debiandebian_linux
debianlinux< linux 6.1.76-1 (bookworm)linux 6.1.76-1 (bookworm)
linuxlinux
linuxlinux>= 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 < 95b1d336b0642198b56836b89908d07b9a0c960895b1d336b0642198b56836b89908d07b9a0c9608
linuxlinux>= 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 < 252a2a5569eb9f8d16428872cc24dea1ac0bb097252a2a5569eb9f8d16428872cc24dea1ac0bb097
linuxlinux>= 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 < 7e7a0d86542b0ea903006d3f42f33c4f7ead69187e7a0d86542b0ea903006d3f42f33c4f7ead6918
linuxlinux>= 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 < 98fee5bee97ad47b527a997d5786410430d1f0e998fee5bee97ad47b527a997d5786410430d1f0e9
linuxlinux>= 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 < 6696f76c32ff67fec26823fc2df46498e70d9bf36696f76c32ff67fec26823fc2df46498e70d9bf3
linuxlinux>= 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 < 67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3e67f16bf2cc1698fd50e01ee8a2becc5a8e6d3a3e
linuxlinux>= 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 < 77d210e8db4d61d43b2d16df66b1ec46fad2ee0177d210e8db4d61d43b2d16df66b1ec46fad2ee01
linuxlinux>= 457b9a6f09f011ebcb9b52cc203a6331a6fc2de7 < 9a9ab0d963621d9d12199df9817e66982582d5a59a9ab0d963621d9d12199df9817e66982582d5a5
linuxlinux_kernel>= 0 < 5.10.209-15.10.209-1
linuxlinux_kernel>= 0 < 6.1.76-16.1.76-1
linuxlinux_kernel>= 0 < 6.6.15-16.6.15-1
linuxlinux_kernel>= 0 < 6.6.15-16.6.15-1
linuxlinux_kernel>= 0 < 5.4.0-176.1965.4.0-176.196
linuxlinux_kernel>= 0 < 5.15.0-102.1125.15.0-102.112
linuxlinux_kernel>= 2.6.29 < 4.19.3064.19.306
linuxlinux_kernel>= 4.20 < 5.4.2685.4.268
linuxlinux_kernel>= 5.11 < 5.15.1485.15.148
linuxlinux_kernel>= 5.16 < 6.1.756.1.75
linuxlinux_kernel>= 5.5 < 5.10.2095.10.209
linuxlinux_kernel>= 6.2 < 6.6.146.6.14
linuxlinux_kernel>= 6.7 < 6.7.26.7.2

CVSS provenance

nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
osv8.1HIGH
vendor_ubuntu7.5HIGH
vendor_debian4.7MEDIUM
vendor_redhat4.7MEDIUM
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