CVE-2026-98306seg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation
- —Not scoredno CVSS score yet
- 0.18%Exploitation in 30 daysEPSS · top 92% 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: seg6: set IPSKB_L3SLAVE from IP6SKB_L3SLAVE on IPIP decapsulation When an SRv6 packet arrives on an interface enslaved to a VRF, vrf_ip6_rcv() sets IP6SKB_L3SLAVE in IP6CB, but decap_and_validate() has never set IPSKB_L3SLAVE in IPCB. The bit stayed clear in the common case, and with CONFIG_IPV6_MIP6 the leftover frag_max_size of a reassembled outer packet could even set it, with no VRF involved. Commit 44930446dde4 ("ipv6: seg6: clear IPv4 control block on IPIP decapsulation") then made the unreliable bit reliably clear. The effect of the missing flag is visible with End.DX4 when a delivery to a local address of the node reaches the socket lookup. For example, a UDP socket bound to the enslaved ingress interface does not receive any of the decapsulated packets, while an unbound socket outside the VRF does. This contradicts Documentation/networking/vrf.rst: by default the scope of an unbound UDP or TCP socket is limited to the default VRF. Set IPSKB_L3SLAVE for IPv4 in decap_and_validate(), which already does the same for IPv6. The socket lookup then matches the decapsulated packet like any other packet received on that enslaved interface. Such a packet matches an unbound UDP or TCP socket only when udp_l3mdev_accept or tcp_l3mdev_accept is set.
Timeline
ID reserved
By Linux
- 11 days later
· 11 days later
Published
- 13 days later
· 13 days 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)
- 0.18% · top 92% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 – < 1d9f5c78903dd25a3556229eb716dd465c5f3573
- affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 – < 72f410616000d21a0a6ec6c93a60301b9c92e95c
- affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 – < e4d7c52f15f572608374947c6c802052e1a2fc82
- affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 – < 5130afa025c95faa621adf8bac525baeb2b290d2
- affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 – < f8fb4738ccef5f9d107845b05734a56352747b1a
- affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 – < ddf60220c925b54a1714c4722fdbdb12833232d0
- affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 – < 8c16e1ccc082a3763dfc6bc2d3f658c1a6336f9d
- affected 891ef8dd2a8d14e4e73a81dcdb135b574c57f556 – < 7616242a2b37883f7322aaa1d2bd6cd0fed28315
- affected 4.14
- unaffected < 4.14
- unaffected 5.10.271 – ≤ 5.10.*
- unaffected 5.15.222 – ≤ 5.15.*
- unaffected 6.1.189 – ≤ 6.1.*
- unaffected 6.6.158 – ≤ 6.6.*
- unaffected 6.12.112 – ≤ 6.12.*
- unaffected 6.18.54 – ≤ 6.18.*
- unaffected 7.2.8 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/1d9f5c78903dd25a3556229eb716dd465c5f3573 (opens in a new tab)
- https://git.kernel.org/stable/c/72f410616000d21a0a6ec6c93a60301b9c92e95c (opens in a new tab)
- https://git.kernel.org/stable/c/e4d7c52f15f572608374947c6c802052e1a2fc82 (opens in a new tab)
- https://git.kernel.org/stable/c/5130afa025c95faa621adf8bac525baeb2b290d2 (opens in a new tab)
- https://git.kernel.org/stable/c/f8fb4738ccef5f9d107845b05734a56352747b1a (opens in a new tab)
- https://git.kernel.org/stable/c/ddf60220c925b54a1714c4722fdbdb12833232d0 (opens in a new tab)
- https://git.kernel.org/stable/c/8c16e1ccc082a3763dfc6bc2d3f658c1a6336f9d (opens in a new tab)
- https://git.kernel.org/stable/c/7616242a2b37883f7322aaa1d2bd6cd0fed28315 (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-2026-93291 (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-2026-98306)Record last updated .