CVE-2026-97964ppp_synctty: ensure a writeable skb header
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- 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 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4cf476ced45d7f12df30a68e833b263e7a2202d1 before 25e03eeead2c49748c7582dfb64c205f93a42d00; from 4cf476ced45d7f12df30a68e833b263e7a2202d1 before a256f9925288ef47de8febed5c38d5cc21340211; from 4cf476ced45d7f12df30a68e833b263e7a2202d1 before 7953946f68262a8bb137aa101249adef6e029652; 4cf476ced45d7f12df30a68e833b263e7a2202d1 builds before 3af7797fbabc84992e0ca5ad2bc0ca8537d053ef; from 4cf476ced45d7f12df30a68e833b263e7a2202d1 before 0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e; from 4cf476ced45d7f12df30a68e833b263e7a2202d1 before 15d0a6c9a42df2d745c37510dba828f6dbe60d9f; from 4cf476ced45d7f12df30a68e833b263e7a2202d1 before 8aaeb56aff2a557a88f83ae866da2c91ad247e59 | CNA record |
References
- https://git.kernel.org/stable/c/25e03eeead2c49748c7582dfb64c205f93a42d00
- https://git.kernel.org/stable/c/a256f9925288ef47de8febed5c38d5cc21340211
- https://git.kernel.org/stable/c/7953946f68262a8bb137aa101249adef6e029652
- https://git.kernel.org/stable/c/3af7797fbabc84992e0ca5ad2bc0ca8537d053ef
- https://git.kernel.org/stable/c/0996c3e6bcc6ae08cb371ed43648c9f7f748ae6e
- https://git.kernel.org/stable/c/15d0a6c9a42df2d745c37510dba828f6dbe60d9f
- https://git.kernel.org/stable/c/8aaeb56aff2a557a88f83ae866da2c91ad247e59
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.