CVE-2026-31438
5.5 MEDIUMIn the Linux kernel, the following vulnerability has been resolved: netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators ...
Published: 2026-04-22 · Last updated: 2026-05-19
Severity and scoring
- CVSS
- 5.5 MEDIUM
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CWE
- CWE-476
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-31438
- [Patch]https://git.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802e
- [Patch]https://git.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6d
- [Patch]https://git.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78e
- [Patch]https://git.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14
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