Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-43093

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
06/05/2026
Last modified:
08/05/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> xsk: tighten UMEM headroom validation to account for tailroom and min frame<br /> <br /> The current headroom validation in xdp_umem_reg() could leave us with<br /> insufficient space dedicated to even receive minimum-sized ethernet<br /> frame. Furthermore if multi-buffer would come to play then<br /> skb_shared_info stored at the end of XSK frame would be corrupted.<br /> <br /> HW typically works with 128-aligned sizes so let us provide this value<br /> as bare minimum.<br /> <br /> Multi-buffer setting is known later in the configuration process so<br /> besides accounting for 128 bytes, let us also take care of tailroom space<br /> upfront.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.80
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools