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medium5.5

CVE-2025-23138

In the Linux kernel, the following vulnerability has been resolved: watch_queue: fix pipe accounting mismatch Currently, watch_queue_set_size() modifies the pi…

Impact

In the Linux kernel, the following vulnerability has been resolved: watch_queue: fix pipe accounting mismatch Currently, watch_queue_set_size() modifies the pipe buffers charged to user->pipe_bufs without updating the pipe->nr_accounted on the pipe itself, due to the if (!pipe_has_watch_queue()) test in pipe_resize_ring(). This means that when the pipe is ultimately freed, we decrement user->pipe_bufs by something other than what than we had charged to it, potentially leading to an underflow. This in turn can cause subsequent too_many_pipe_buffers_soft() tests to fail with -EPERM. To remedy this, explicitly account for the pipe usage in watch_queue_set_size() to match the number set via account_pipe_buffers() (It's unclear why watch_queue_set_size() does not update nr_accounted; it may be due to intentional overprovisioning in watch_queue_set_size()?)

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 5.10.210 before 5.10.236
from 5.15.149 before 5.15.180
from 6.1.76 before 6.1.134
from 6.6.15 before 6.6.87
from 6.7.3 before 6.12.23
from 6.13 before 6.13.11
DebianDebian Linux
Version 11.0

References