UnratedFix available
watch_queue: fix pipe accounting mismatch
Type: advisorySources: OSV
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()?)
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.236, 5.15.180, 6.1.134, 6.12.23, 6.13.11, 6.14.2, 6.6.87
- CVEs
- CVE-2025-23138
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 6 Nov 2026, 03:23 UTC · Revision 1
Source evidence
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()?)
osv:CVE-2025-23138
Kernel
Fixed versions: 5.10.236, 5.15.180, 6.1.134, 6.6.87, 6.12.23, 6.13.11, 6.14.2
Complete source record
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"modified": "2026-10-28T02:30:46.555399152Z",
"provider": "osv",
"references": [
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"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
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"source_id": "core-osv",
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"published_at": "2025-04-16T14:13:17.866+00:00"
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