CVE-2026-97610

/// Technical description

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

netfs: Fix uninitialized return value in netfs_unbuffered_write()

If preparation of the first subrequest fails,

netfs_unbuffered_write() exits its loop before ret is initialized. The

empty-iterator check can do the same.

For synchronous writes, netfs_unbuffered_write_iter_locked() may then

return an unrelated error instead of wreq->error. This is reachable

through CIFS if cifs_prepare_write() fails to reopen the file or obtain

credits.

Initialize ret to 0 so the caller returns wreq->error if no data was

written, or the number of bytes already written otherwise.

Found with Clang's -Wconditional-uninitialized.

/// 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