CVE-2026-31438
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
36/100
Published: 2026-04-22
Modified: 2026-11-11
First seen: 2026-11-05
Status: active
Attack Surface
Low Complexity
No Interaction
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
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.
Weakness Classification (1)
Affected Software (12)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | cae932d3aee55035a54415dcea8e7ecf2ec469b5 < 18c2e20b42dd21db599e42d05ddaeeb647b2bb6d |
| Linux | Linux | cae932d3aee55035a54415dcea8e7ecf2ec469b5 < 4bc2d72c7695cedf6d4e1a558924903c2b28a78e |
| Linux | Linux | cae932d3aee55035a54415dcea8e7ecf2ec469b5 < 00d6df7115f6972370974212de9088087820802e |
| Linux | Linux | cae932d3aee55035a54415dcea8e7ecf2ec469b5 < 67e467a11f62ff64ad219dc6aa5459e132c79d14 |
| Linux | Linux | 6.8 |
| linux | linux_kernel | 6.8 – 6.12.80 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |