CVE-2026-99033
kernel: net/packet: guard the ll header push in packet_rcv_spkt()
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 23, 2026
Updated · October 29, 2026
Description
A flaw was found in the Linux kernel. A local user with network privileges can trigger a Denial of Service (DoS) by causing a complete system crash. This issue occurs when a packet socket receives traffic on a network interface that lacks a link-layer header, such as a Controller Area Network (CAN) device. Because the kernel fails to verify that the device uses a link-layer header before adjusting packet buffers, it performs an invalid calculation that forces a fatal kernel panic.
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-617 · Reachable Assertion