CVE-2026-80792

CVE CVE-2026-80792EUVD EUVD-2026-71435Published 2026-09-04T15:13:04.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix use-after-free in ip6_finish_output2() ip6_finish_output2() caches a pointer to the IPv6 destination address (daddr) before invoking lwtunnel_xmit(). The LWT-BPF transmit path or other encapsulation operations within lwtunnel_xmit() can reallocate the skb head, freeing the memory that daddr points to. When lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, the function continues to use the stale daddr pointer to compute the nexthop and to look up or create the neighbour entry. This results in a use-after-free read, which can leak sensitive kernel data, pollute the neighbour table with arbitrary values, misdirect traffic, or crash the system. Fix this by re-fetching the IPv6 header and the destination address pointer after lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop computation and neighbour lookup operate on valid memory.

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 5.4.289 <5.5; patch: 6.6.154; e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 <73a187384a8c8b983c7fea046d716b6752a1e7a3; e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 <d960881b9312e781a3429aabceb223ce6b7c882f; e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 <99219c82804f266189388e8bf1cf5135d10d5515; 5.15; e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 <d0d48d999b0eee6bb176ef4e39d9be868fa80f7e; patch: 6.1.185; patch: 0; e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 <3c770ac4e6f07af7c7b40c474a3efc61ffed7862; patch: 5.15.218; patch: 7.2.1; patch: 5.10.267; patch: 6.12.106; patch: 6.18.47; 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85 <75e0a544ebe9af663ef53ca21e9e9185c51fb54a; patch: 7.1.11; e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 <c95f01b78266828a57060d754fcbfc92123a98ed; e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 <3dc98e5fe82d069dd29b124ffbdb679331dfea43; 1598154fd28ffa4a55beae1970475fd6776554b6; e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 <087ee0d914aaae929f1660c9ca878e367655ba1a; patch: 7.3-rc1; 5.10.233 <5.10.267

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

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Linux — Linux

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