# CVE-2026-31438

> Vulnerability.

## Description

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

netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators

When a process crashes and the kernel writes a core dump to a 9P
filesystem, __kernel_write() creates an ITER_KVEC iterator. This
iterator reaches netfs_limit_iter() via netfs_unbuffered_write(), which
only handles ITER_FOLIOQ, ITER_BVEC and ITER_XARRAY iterator types,
hitting the BUG() for any other type.

Fix this by adding netfs_limit_kvec() following the same pattern as
netfs_limit_bvec(), since both kvec and bvec are simple segment arrays
with pointer and length fields. Dispatch it from netfs_limit_iter() when
the iterator type is ITER_KVEC.

## Key facts

- **CVE ID:** CVE-2026-31438
- **Published:** 2026-04-22

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31438

## Citation

> AI Analytics. CVE-2026-31438. Retrieved 2026-07-27 from https://api.ai-analytics.org/cve/CVE-2026-31438. Derived from NIST NVD. Licensed CC0.

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