VULNERABILITY

Debian: CVE-2025-23138: linux -- security update

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Debian: CVE-2025-23138: linux -- security update

Severity
6
CVSS
(AV:L/AC:L/Au:S/C:N/I:C/A:C)
Published
04/16/2025
Created
04/29/2025
Added
04/29/2025
Modified
04/30/2025

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()?)

Solution(s)

  • debian-upgrade-linux

References

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