Answer in brief
CVE-2026-31438 records a Unknown severity vulnerability in netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=cae932d3aee55035a54415dcea8e7ecf2ec469b5 <18c2e20b42dd21db599e42d05ddaeeb647b2bb6d || >=cae932d3aee55035a54415dcea8e7ecf2ec469b5 <4bc2d72c7695cedf6d4e1a558924903c2b28a78e || >=cae932d3aee55035a54415dcea8e7ecf2ec469b5 <00d6df7115f6972370974212de9088087820802e || >=cae932d3aee55035a54415dcea8e7ecf2ec469b5 <67e467a11f62ff64ad219dc6aa5459e132c79d14 | 18c2e20b42dd21db599e42d05ddaeeb647b2bb6d, 4bc2d72c7695cedf6d4e1a558924903c2b28a78e, 00d6df7115f6972370974212de9088087820802e, 67e467a11f62ff64ad219dc6aa5459e132c79d14 |
| Linux/Linuxgeneric | 6.8 | Not reported |
Published upstream
Apr 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.