CVE-2026-46234

HIGH

vsock: fix buffer size clamping order

Title source: cna
STIX 2.1

Description

In the Linux kernel, the following vulnerability has been resolved: vsock: fix buffer size clamping order In vsock_update_buffer_size(), the buffer size was being clamped to the maximum first, and then to the minimum. If a user sets a minimum buffer size larger than the maximum, the minimum check overrides the maximum check, inverting the constraint. This breaks the intended socket memory boundaries by allowing the vsk->buffer_size to grow beyond the configured vsk->buffer_max_size. Fix this by checking the minimum first, and then the maximum. This ensures the buffer size never exceeds the buffer_max_size.

Scores

CVSS v3 7.8
EPSS 0.0013
EPSS Percentile 2.8%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-787
Status published
Products (20)
Linux/Linux < 5.5
Linux/Linux 5.10.258 - 5.10.*
Linux/Linux 5.15.209 - 5.15.*
Linux/Linux 5.5
Linux/Linux 6.1.175 - 6.1.*
Linux/Linux 6.12.90 - 6.12.*
Linux/Linux 6.18.32 - 6.18.*
Linux/Linux 6.6.140 - 6.6.*
Linux/Linux 7.0.9 - 7.0.*
Linux/Linux 7.1
... and 10 more
Published May 28, 2026
Tracked Since May 28, 2026