CVE-2026-80792ipv6: fix use-after-free in ip6_finish_output2()
- —Not scoredno CVSS score yet
- 0.19%Exploitation in 30 daysEPSS · top 91% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 9 days later
· 9 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85 – < 75e0a544ebe9af663ef53ca21e9e9185c51fb54a
- affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 – < c95f01b78266828a57060d754fcbfc92123a98ed
- affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 – < d960881b9312e781a3429aabceb223ce6b7c882f
- affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 – < 087ee0d914aaae929f1660c9ca878e367655ba1a
- affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 – < 3c770ac4e6f07af7c7b40c474a3efc61ffed7862
- affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 – < 3dc98e5fe82d069dd29b124ffbdb679331dfea43
- affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 – < 99219c82804f266189388e8bf1cf5135d10d5515
- affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 – < 73a187384a8c8b983c7fea046d716b6752a1e7a3
- affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 – < d0d48d999b0eee6bb176ef4e39d9be868fa80f7e
- affected 1598154fd28ffa4a55beae1970475fd6776554b6
- affected 5.10.233 – < 5.10.267
- affected 5.4.289 – < 5.5
- affected 5.15
- unaffected < 5.15
- unaffected 5.10.267 – ≤ 5.10.*
- unaffected 5.15.218 – ≤ 5.15.*
- unaffected 6.1.185 – ≤ 6.1.*
- unaffected 6.6.154 – ≤ 6.6.*
- unaffected 6.12.106 – ≤ 6.12.*
- unaffected 6.18.47 – ≤ 6.18.*
- unaffected 7.1.11 – ≤ 7.1.*
- unaffected 7.2.1 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References9
- https://git.kernel.org/stable/c/75e0a544ebe9af663ef53ca21e9e9185c51fb54a (opens in a new tab)
- https://git.kernel.org/stable/c/c95f01b78266828a57060d754fcbfc92123a98ed (opens in a new tab)
- https://git.kernel.org/stable/c/d960881b9312e781a3429aabceb223ce6b7c882f (opens in a new tab)
- https://git.kernel.org/stable/c/087ee0d914aaae929f1660c9ca878e367655ba1a (opens in a new tab)
- https://git.kernel.org/stable/c/3c770ac4e6f07af7c7b40c474a3efc61ffed7862 (opens in a new tab)
- https://git.kernel.org/stable/c/3dc98e5fe82d069dd29b124ffbdb679331dfea43 (opens in a new tab)
- https://git.kernel.org/stable/c/99219c82804f266189388e8bf1cf5135d10d5515 (opens in a new tab)
- https://git.kernel.org/stable/c/73a187384a8c8b983c7fea046d716b6752a1e7a3 (opens in a new tab)
- https://git.kernel.org/stable/c/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-71435 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80792)Record last updated .