CVE-2026-68123

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-68123

Key Details

CVE	CVE-2026-68123
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

openvswitch: fix GSO userspace truncation underflow

OVS_ACTION_ATTR_TRUNC currently stores a delta from the original skb

length in OVS_CB(skb)->cutlen. When a later userspace action segments a

GSO skb, queue_gso_packets() reuses that delta for each smaller segment.

A segment can then reach queue_userspace_packet() with cutlen greater

than skb->len, underflowing the length passed to skb_zerocopy().

Store the maximum preserved length instead and bound each consumer

against the current skb length. Use U32_MAX as the no-truncation

sentinel so the value remains valid if skb geometry changes before a

consumer handles it. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-68123
CVE	https://www.cve.org/CVERecord?id=CVE-2026-68123

Source

Reference

NVD

CVE