CVE-2026-68121

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-68121

Key Details

CVE	CVE-2026-68121
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; 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:

pppoe: reload header pointer after dev_hard_header()

pppoe_sendmsg() saves a pointer to the PPPoE header before calling

dev_hard_header(). Device header callbacks are allowed to reallocate the

skb head, invalidating pointers into it.

This can happen when a send is blocked in copy_from_user() while the first

non-Ethernet port is added to an empty team device. The team's delegated

GRE header callback then expands the skb head. PPPoE subsequently writes

six bytes through the stale pointer into the freed head.

Reload the PPPoE header through the skb's network-header offset after

device header creation. pskb_expand_head() updates that offset when it

relocates the head. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-68121
CVE	https://www.cve.org/CVERecord?id=CVE-2026-68121

Source

Reference

NVD

CVE