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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-68121 Detail

Description

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/6866abf59976d273164a6624234d96a967280223 kernel.org
https://git.kernel.org/stable/c/7e9fbd7f96bcde63a7c798fe16b38cedee7a1501 kernel.org
https://git.kernel.org/stable/c/bed4caecd723693f750e13adbb2c42ca1249a3fd kernel.org
https://git.kernel.org/stable/c/e6493a4d1ee17595766165fa446d45b7e0c318d0 kernel.org
https://git.kernel.org/stable/c/e9c238f6fe42fb1b4dba3a578277de32cb487937 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-68121
NVD Published Date:
08/10/2026
NVD Last Modified:
08/13/2026
Source:
kernel.org