CVE-2026-98526

kernel: llc: reserve device headroom for allocated frames

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Severity

Moderate

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · October 18, 2026

Updated · October 20, 2026

Description

A flaw was found in the Linux kernel's Logical Link Control (LLC) subsystem. This flaw allows an adjacent attacker to cause a Denial of Service (DoS) via a kernel crash. When transmitting an LLC response over stacked network interfaces, such as Virtual Local Area Networks (VLANs), the kernel allocates network buffers without sufficient headroom for layered headers. This failure causes a buffer underflow during packet construction, terminating system operations.

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 · 6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-124 · Buffer Underwrite ('Buffer Underflow')