UNKNOWN NVD
CVE-2026-97964
In the Linux kernel, the following vulnerability has been resolved: ppp_synctty: ensure a writeable skb header ppp_sync_txmunge() checks headroom before prepe
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.
References
- https://git.kernel.org/stable/c/0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e
- https://git.kernel.org/stable/c/15d0a6c9a42df2d745c37510dba828f6dbe60d9f
- https://git.kernel.org/stable/c/3af7797fbabc84992e0ca5ad2bc0ca8537d053ef
- https://git.kernel.org/stable/c/8aaeb56aff2a557a88f83ae866da2c91ad247e59
This unknown severity vulnerability was published on 2026-09-25 via NVD.
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