CVE-2026-72251

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A memory bug and header corruption issue exists in the SIP NAT helper within the netfilter component. In the nf nat sip() function, if a cloned or fragmented socket buffer (SKB) is reallocated by skb ensure writable(), the original data buffer is freed, but the function fails to update the data pointer to the new buffer, leading to a stale pointer. Additionally, the function may incorrectly call nf nat mangle udp packet() on TCP packets, which can result in the sequence number being overwritten by a checksum update.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.