CVE-2026-97618

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

io_uring/net: don't overconsume buffers when using MSG_TRUNC

When a recv/recvmsg is issued with MSG_TRUNC and the incoming packet is

larger than the provided buffer, the net layer returns the full length

of the packet rather than the number of bytes actually copied into the

buffer. As a result, io_uring advances more of the provided buffer ring

than was actually filled. Use the actual filled region size to consume

the buffer, but still return the full size to preserve MSG_TRUNC

semantics.

Take care with multishot, because that seems to already truncate the

consumption based on the available payload size.

This was reported in https://github.com/axboe/liburing/issues/1619.

[axboe: fold in size_t unsigned fix]

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References