CVE-2025-38730

What it actually does

In io_uring networking, partial retries with MSG_WAITALL or stream sockets can pin ring-provided buffers across executions instead of recycling them, allowing use-after-unregister or concurrent consumption of the same buffer memory by multiple sockets and resulting in data corruption or invalid memory access.

Why it matters to the business

Applications relying on io_uring for high-performance networking on Linux kernels may experience silent data corruption, crashes, or unexpected behavior, increasing operational risk and potential downtime in containerized or performance-critical environments until patched.

How an attack unfolds

An attacker configures an io_uring instance with a provided buffer ring, initiates network receives using MSG_WAITALL or on streaming sockets that return partial data, then either unregisters the buffer ring before retry or arranges concurrent receives from multiple sockets on the same buffer group to trigger reuse of the same userspace buffer and corrupt application data.

How to fix it

Upgrade affected Linux kernel installations to the fixed commit 3b53dc1c641f2884d4750fc25aaf6c36b90db606. For listed MinimOS packages update to version 18.0.6-r0. Rebuild and redeploy containers or systems using the updated packages and restart affected services.

How to confirm the fix worked

Verify the running kernel contains commit 3b53dc1c641f2884d4750fc25aaf6c36b90db606 or later via uname or kernel source inspection. Confirm package versions match the fixed releases and test io_uring networking workloads with buffer rings and MSG_WAITALL to ensure no partial buffer pinning occurs.

Typical attack path

1. Create io_uring ring with provided buffer group
2. Register buffer ring and post networking receive requests with MSG_WAITALL or on stream sockets
3. Trigger partial buffer consumption requiring retry
4. Unregister buffer ring or initiate concurrent receives on shared group before retry completes
5. Observe or induce data corruption or invalid buffer access in target application

How to detect it

Review kernel logs and application logs for io_uring buffer management errors or data corruption symptoms after buffer ring unregistration; correlate with process activity involving io_uring and network sockets.

What your security team should do

• Prioritize kernel and package upgrades on all systems using io_uring networking
• Monitor for EPSS increases and any new exploit reports given the 418 days since publication
• Restrict use of provided buffer rings with networking sockets until patched
• Audit applications for io_uring usage and schedule staged rollouts of fixed versions