CVE-2026-72137

CVE CVE-2026-72137EUVD EUVD-2026-58895Published 2026-08-15T05:53:11.000ZLast changed 2026-08-17T05:40:47.000ZCVSS 9.8

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: xfrm: nat_keepalive: avoid double free on send error nat_keepalive_send() frees the keepalive skb whenever the IPv4 or IPv6 send helper reports an error. That cleanup is only correct before the skb is handed to the output path. Once ip_build_and_send_pkt() or ip6_xmit() takes ownership, the networking stack may already have consumed the skb before returning an error, so freeing it again is unsafe. Handle the pre-handoff failure cases inside nat_keepalive_send_ipv4() and nat_keepalive_send_ipv6(), where the caller still owns the skb, and keep nat_keepalive_send() responsible only for family dispatch and the unsupported-family cleanup path.

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 6.11; f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae <a8a7e6a9ff8a4c1f067694ddbd44be67fdf36693; patch: 0; patch: 7.1.5; patch: 6.12.101; patch: 7.2; f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae <5b0c4c916f202b8fd13d12afb6af62b385622f81; f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae <d0a4dc7efa825bce60a8da8f7d43c864a159abde; patch: 6.18.40; f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae <226f4a490d1a938fc838d8f8c46a4eca864c0d78

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

Does this concern one of your customers?

This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.

Try it for 28 days

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.