CVE-2026-80792None▾ SunlitIn 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 LW…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85 < 75e0a544ebe9af663ef53ca21e9e9185c51fb54aLinux >= e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 < c95f01b78266828a57060d754fcbfc92123a98edLinux >= e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 < d960881b9312e781a3429aabceb223ce6b7c882fLinux >= e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 < 087ee0d914aaae929f1660c9ca878e367655ba1aLinux >= e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 < 3c770ac4e6f07af7c7b40c474a3efc61ffed7862Linux >= e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 < 3dc98e5fe82d069dd29b124ffbdb679331dfea43Linux >= e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 < 99219c82804f266189388e8bf1cf5135d10d5515Linux >= e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 < 73a187384a8c8b983c7fea046d716b6752a1e7a3Linux >= e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 < d0d48d999b0eee6bb176ef4e39d9be868fa80f7eLinux 1598154fd28ffa4a55beae1970475fd6776554b6Linux >= 5.10.233 < 5.10.267Linux >= 5.4.289 < 5.5Linux 5.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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