CVE-2026-46273
kernel: ibmveth: Disable GSO for packets with small MSS
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · June 3, 2026
Updated · August 5, 2026
Description
A flaw was found in the Linux kernel's ibmveth driver. This vulnerability occurs when physical adapters on Power systems attempt to perform Generic Segmentation Offload (GSO) with a Maximum Segment Size (MSS) less than 224 bytes. A remote attacker could exploit this by sending specially crafted network packets, leading to the adapter freezing and a complete Denial of Service (DoS) for all network traffic until a manual reset.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-1284 · Improper Validation of Specified Quantity in Input