High 7.8Published Aug 10, 2026

CVE-2026-68121pppoe: reload header pointer after dev_hard_header()

Updated under an hour ago (Oct 27, 2026, 6:40 AM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7a56e7c9b08e08fd55a1bcada24cf4fe3782b722; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6eed5ae7887a93160803d2b81ff88e75eefd4a4c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ba3409369c5413cdf0dcbf3a928f76b48e8c3e6a; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e6493a4d1ee17595766165fa446d45b7e0c318d0; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7e9fbd7f96bcde63a7c798fe16b38cedee7a1501; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 6866abf59976d273164a6624234d96a967280223; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before bed4caecd723693f750e13adbb2c42ca1249a3fd; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e9c238f6fe42fb1b4dba3a578277de32cb487937	CNA record

References

References

https://git.kernel.org/stable/c/7a56e7c9b08e08fd55a1bcada24cf4fe3782b722
https://git.kernel.org/stable/c/6eed5ae7887a93160803d2b81ff88e75eefd4a4c
https://git.kernel.org/stable/c/ba3409369c5413cdf0dcbf3a928f76b48e8c3e6a
https://git.kernel.org/stable/c/e6493a4d1ee17595766165fa446d45b7e0c318d0
https://git.kernel.org/stable/c/7e9fbd7f96bcde63a7c798fe16b38cedee7a1501
https://git.kernel.org/stable/c/6866abf59976d273164a6624234d96a967280223
https://git.kernel.org/stable/c/bed4caecd723693f750e13adbb2c42ca1249a3fd
https://git.kernel.org/stable/c/e9c238f6fe42fb1b4dba3a578277de32cb487937

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.