CVE-2026-68121

CVE CVE-2026-68121EUVD EUVD-2026-55502Published 2026-08-10T11:58:41.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6493a4d1ee17595766165fa446d45b7e0c318d0; 2.6.12; patch: 0; patch: 7.2-rc5; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e9c238f6fe42fb1b4dba3a578277de32cb487937; patch: 6.12.101; patch: 6.6.148; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7e9fbd7f96bcde63a7c798fe16b38cedee7a1501; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bed4caecd723693f750e13adbb2c42ca1249a3fd; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6866abf59976d273164a6624234d96a967280223; patch: 7.1.6; patch: 6.18.42

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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