CVE-2026-43036

kernel: net: use skb_header_pointer() for TCPv4 GSO frag_off check

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · May 1, 2026

Updated · June 28, 2026

Description

A flaw was found in the Linux kernel's networking subsystem. An attacker injecting specially crafted packets through PF_PACKET paths could trigger an uninitialized value read when processing TCPv4 Generic Segmentation Offload (GSO) packets. This vulnerability, specifically in the gso_features_check() function, could lead to information disclosure due to unsafe direct dereference of IPv4 header offsets.

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-824 · Access of Uninitialized Pointer