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CVE-2025-23138

watch_queue: fix pipe accounting mismatch

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.236, 5.15.180, 6.1.134, 6.6.87, 6.8
None on Exploit-DB, Metasploit or GitHub

Summary

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()?)

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 5.10.210 · fixed in 5.10.236; From 5.15.149 · fixed in 5.15.180; From 6.1.76 · fixed in 6.1.134; From 6.6.15 · fixed in 6.6.87; From 6.7.3 · fixed in 6.8

  • Linux Linux

    6.8

References 8

git.kernel.org