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Not yet scoredPublished Sep 25, 2026

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 19, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

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

References

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.

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CVE-2026-97964: ppp_synctty: ensure a writeable skb header | InfoSec Signals