Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae before d0a4dc7efa825bce60a8da8f7d43c864a159abde; affected f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae before 5b0c4c916f202b8fd13d12afb6af62b385622f81; affected f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae before a8a7e6a9ff8a4c1f067694ddbd44be67fdf36693; affected f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae before 226f4a490d1a938fc838d8f8c46a4eca864c0d78 |
| Linux / Linux | affected 6.11; unaffected 0 before 6.11; unaffected 6.12.101 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.