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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.8, < 6.12.80 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/00d6df7115f6972370974212de9088087820802ePatch
- https://git.kernel.org/stable/c/18c2e20b42dd21db599e42d05ddaeeb647b2bb6dPatch
- https://git.kernel.org/stable/c/4bc2d72c7695cedf6d4e1a558924903c2b28a78ePatch
- https://git.kernel.org/stable/c/67e467a11f62ff64ad219dc6aa5459e132c79d14Patch
FAQ
What is CVE-2026-31438?
CVE-2026-31438 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 ...
How severe is CVE-2026-31438?
CVE-2026-31438 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31438?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.