CVE-2026-89565
CVE CVE-2026-89565EUVD EUVD-2026-76476Published 2026-09-11T19:44:35.000ZLast changed 2026-09-14T12:01:04.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: ipip: fix skb leak in collect_md mode when metadata_dst allocation fails In collect_md mode ipip_tunnel_rcv() returns 0 without freeing the skb when ip_tun_rx_dst() fails to allocate the metadata_dst. ipip_rcv() and mplsip_rcv() are registered as xfrm_tunnel handlers, so tunnel4_rcv() and tunnelmpls4_rcv() read the zero return as "the packet has been consumed" and do not free it either. The skb is leaked. The other tunnel drivers all dispose of the packet at this point: ip6_tunnel.c jumps to its drop label, ip_gre.c and ip6_gre.c return PACKET_REJECT, which makes gre_rcv() free the skb. Only ipip returns 0. Jump to the existing drop label instead. It frees the skb and still returns 0, so the packet keeps being reported as consumed, which is what we want here: the outer header has already been pulled, and neither the remaining handlers nor an ICMP unreachable have any use for it. Triggering this needs an ipip or mplsip tunnel in collect_md mode and an atomic allocation failure, which is why it has gone unnoticed.
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 patch: 6.1.188; patch: 6.6.157; patch: 6.12.109; cfc7381b3002756b1dcada32979e942aa3126e31 <1909df2d066424767429e13053eb9701263430ef; cfc7381b3002756b1dcada32979e942aa3126e31 <fd01f1a3ed4a189a784654f7c69eb565872f2e12; cfc7381b3002756b1dcada32979e942aa3126e31 <c4dc23de4cc75e4e304170b31bb8aeeacd5cb990; patch: 7.2.4; cfc7381b3002756b1dcada32979e942aa3126e31 <6d8c5b266d0035a061573843a7243be068eb6118; 4.9; cfc7381b3002756b1dcada32979e942aa3126e31 <31e4be21dacee49395013caae28576484a049a4f; patch: 7.3-rc1; cfc7381b3002756b1dcada32979e942aa3126e31 <6776efe4a52f289a3fc18f8adf19b035a7d8e1bb; patch: 0; patch: 6.18.50
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
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