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 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()?)

• linux linux kernel (>= 5.10.210 < 5.10.236) • linux linux kernel (>= 5.15.149 < 5.15.180) • linux linux kernel (>= 6.1.76 < 6.1.134) • linux linux kernel (>= 6.6.15 < 6.6.87) • linux linux kernel (>= 6.7.3 < 6.12.23) • linux linux kernel (>= 6.13 < 6.13.11) • linux linux kernel (>= 6.14 < 6.14.2) • debian debian linux 11.0