CVE-2025-23138

watch_queue: fix pipe accounting mismatch

State: Published
Severity: Not scored
Published: Apr 16, 2025
Updated: May 23, 2026
Reserved: Jan 11, 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()?)

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	162ae0e78bdabf84ef10c1293c4ed7865cb7d3c8 to before 8658c75343ed00e5e154ebbe24335f51ba8db547Affected 3efbd114b91525bb095b8ae046382197d92126b9 to before 471c89b7d4f58bd6082f7c1fe14d4ca15c7f1284Affected b87a1229d8668fbc78ebd9ca0fc797a76001c60f to before d40e3537265dea9e3c33021874437ff26dc18787Affected 68e51bdb1194f11d3452525b99c98aff6f837b24 to before 6dafa27764183738dc5368b669b71e3d0d154f12Affected e95aada4cb93d42e25c30a0ef9eb2923d9711d4a to before 56ec918e6c86c1536870e4373e91eddd0c44245fAffected e95aada4cb93d42e25c30a0ef9eb2923d9711d4a to before 2d680b988656bb556c863d8b46d9b9096842bf3dAffected e95aada4cb93d42e25c30a0ef9eb2923d9711d4a to before 205028ebba838938d3b264dda1d0708fa7fe1adeAffected e95aada4cb93d42e25c30a0ef9eb2923d9711d4a to before f13abc1e8e1a3b7455511c4e122750127f6bc9b0Affected 6fb70694f8d1ac34e45246b0ac988f025e1e5b55Affected 5.10.210 to before 5.10.236Affected 5.15.149 to before 5.15.180Affected 6.1.76 to before 6.1.134Affected 6.6.15 to before 6.6.87Affected 6.7.3 to before 6.8Affected
LinuxLinux	6.8Affected before 6.8Not affected 5.10.236 through 5.10.Not affected 5.15.180 through 5.15.Not affected 6.1.134 through 6.1.Not affected 6.6.87 through 6.6.Not affected 6.12.23 through 6.12.Not affected 6.13.11 through 6.13.Not affected 6.14.2 through 6.14.*Not affected 6.15 and laterNot affected

Product

Versions

LinuxLinux

162ae0e78bdabf84ef10c1293c4ed7865cb7d3c8 to before 8658c75343ed00e5e154ebbe24335f51ba8db547Affected
3efbd114b91525bb095b8ae046382197d92126b9 to before 471c89b7d4f58bd6082f7c1fe14d4ca15c7f1284Affected
b87a1229d8668fbc78ebd9ca0fc797a76001c60f to before d40e3537265dea9e3c33021874437ff26dc18787Affected
68e51bdb1194f11d3452525b99c98aff6f837b24 to before 6dafa27764183738dc5368b669b71e3d0d154f12Affected
e95aada4cb93d42e25c30a0ef9eb2923d9711d4a to before 56ec918e6c86c1536870e4373e91eddd0c44245fAffected
e95aada4cb93d42e25c30a0ef9eb2923d9711d4a to before 2d680b988656bb556c863d8b46d9b9096842bf3dAffected
e95aada4cb93d42e25c30a0ef9eb2923d9711d4a to before 205028ebba838938d3b264dda1d0708fa7fe1adeAffected
e95aada4cb93d42e25c30a0ef9eb2923d9711d4a to before f13abc1e8e1a3b7455511c4e122750127f6bc9b0Affected
6fb70694f8d1ac34e45246b0ac988f025e1e5b55Affected
5.10.210 to before 5.10.236Affected
5.15.149 to before 5.15.180Affected
6.1.76 to before 6.1.134Affected
6.6.15 to before 6.6.87Affected
6.7.3 to before 6.8Affected

LinuxLinux

6.8Affected
before 6.8Not affected
5.10.236 through 5.10.*Not affected
5.15.180 through 5.15.*Not affected
6.1.134 through 6.1.*Not affected
6.6.87 through 6.6.*Not affected
6.12.23 through 6.12.*Not affected
6.13.11 through 6.13.*Not affected
6.14.2 through 6.14.*Not affected
6.15 and laterNot affected

References

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