CVE-2025-23138 - Linux Kernel Pipe Buffer Underflow Vulnerability

CVE-2025-23138 - Linux Kernel Pipe Buffer Underflow Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Wed, 04/16/2025 - 20:36
CVE ID : CVE-2025-23138
Published : April 16, 2025, 3:16 p.m. | 2 hours, 5 minutes ago
Description : 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()?)
Severity: 0.0 | NA
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