SB20260919146 - Integer overflow in Linux kernel virtio_net_hdr_to_skb

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Main Vulnerability Database SB20260919146

SB20260919146 - Integer overflow in Linux kernel virtio_net_hdr_to_skb

Published: September 19, 2026

Security Bulletin ID SB20260919146
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Integer overflow (CVE-ID: CVE-2026-90063)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a 16-bit gso_segs field overflow.

The vulnerability exists due to improper validation of gso_size in virtio_net_hdr_to_skb when processing TCP packets crafted through an AF_PACKET PACKET_VNET_HDR socket. A local user can submit a TCP packet with a gso_size smaller than TCP_MIN_GSO_SIZE to cause a 16-bit gso_segs field overflow.

The condition applies to TCP packets; UDP GSO permits a gso_size of 1.


Remediation

Install update from vendor's website.

References