CVE-2026-80792ipv6: fix use-after-free in ip6_finish_output2()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85 builds before 75e0a544ebe9af663ef53ca21e9e9185c51fb54a; from e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 before c95f01b78266828a57060d754fcbfc92123a98ed; from e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 before d960881b9312e781a3429aabceb223ce6b7c882f; from e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 before 087ee0d914aaae929f1660c9ca878e367655ba1a; from e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 before 3c770ac4e6f07af7c7b40c474a3efc61ffed7862; from e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 before 3dc98e5fe82d069dd29b124ffbdb679331dfea43; from e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 before 99219c82804f266189388e8bf1cf5135d10d5515; from e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 before 73a187384a8c8b983c7fea046d716b6752a1e7a3; and 4 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/75e0a544ebe9af663ef53ca21e9e9185c51fb54a
- https://git.kernel.org/stable/c/c95f01b78266828a57060d754fcbfc92123a98ed
- https://git.kernel.org/stable/c/d960881b9312e781a3429aabceb223ce6b7c882f
- https://git.kernel.org/stable/c/087ee0d914aaae929f1660c9ca878e367655ba1a
- https://git.kernel.org/stable/c/3c770ac4e6f07af7c7b40c474a3efc61ffed7862
- https://git.kernel.org/stable/c/3dc98e5fe82d069dd29b124ffbdb679331dfea43
- https://git.kernel.org/stable/c/99219c82804f266189388e8bf1cf5135d10d5515
- https://git.kernel.org/stable/c/73a187384a8c8b983c7fea046d716b6752a1e7a3
- https://git.kernel.org/stable/c/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.