CVE-2026-97964

CVE CVE-2026-97964EUVD EUVD-2026-86818Published 2026-09-25T10:23:07.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: ppp_synctty: ensure a writeable skb header ppp_sync_txmunge() checks headroom before prepending the address and control bytes, but does not ensure that the skb header is writable. A received skb can reach this function through PPP channel bridging without passing through ppp_start_xmit(), which calls skb_cow_head(). For example, a PPPoE frame may share its buffer with a clone queued to an AF_PACKET socket. If it is bridged to a synchronous tty channel, the address/control bytes can overwrite data still visible to that socket. Use skb_cow_head() to ensure both sufficient headroom and a writable header.

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 5.11; patch: 6.18.53; patch: 7.3-rc3; 4cf476ced45d7f12df30a68e833b263e7a2202d1 <15d0a6c9a42df2d745c37510dba828f6dbe60d9f; patch: 7.2.7; patch: 0; 4cf476ced45d7f12df30a68e833b263e7a2202d1 <3af7797fbabc84992e0ca5ad2bc0ca8537d053ef; 4cf476ced45d7f12df30a68e833b263e7a2202d1 <8aaeb56aff2a557a88f83ae866da2c91ad247e59; 4cf476ced45d7f12df30a68e833b263e7a2202d1 <0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e; patch: 6.12.111

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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