CVE-2026-74597ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
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: ip6_tunnel: clear skb2->cb[] in ip6ip6_err() ip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the quoted inner IPv6 packet, and then passes the clone to icmpv6_send(). The clone still carries the outer packet's inet6_skb_parm in skb->cb. If the outer packet had a Home Address Option, IP6CB(skb2)->dsthao remains non-zero after skb_pull(). icmpv6_send() later calls mip6_addr_swap(), which uses that stale dsthao offset against the quoted inner packet. A malformed inner destination-options header can then make the HAO lookup and address swap run past the end of the quoted packet and corrupt skb_shared_info. Clear skb2->cb[] before pulling the quoted inner IPv6 packet so the reply path does not reuse metadata left by the outer IPv6 stack.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- 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
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e490d1d85cf5e191791979e5f260d32eb4f703a8 before 44fe898df302e91c5ee5acbc71ffa74e78e6c183; from e490d1d85cf5e191791979e5f260d32eb4f703a8 before 0dadb0620ab65949a8bc2439dd28ea3c942fe87d; from e490d1d85cf5e191791979e5f260d32eb4f703a8 before b6816536a2990c0db44a26130a03e40b441e829b; from e490d1d85cf5e191791979e5f260d32eb4f703a8 before 64e41736a26f37ab6215bc2e6df125df05aceb08; from e490d1d85cf5e191791979e5f260d32eb4f703a8 before 484134e1eb07d700a73b1e4bbf3fb503e299be60; from e490d1d85cf5e191791979e5f260d32eb4f703a8 before 4eb15c465337b18f44716c499cd6ad63eee0ad54; from e490d1d85cf5e191791979e5f260d32eb4f703a8 before fbf40faa0414b753212494ad197542002e66ed9e; from e490d1d85cf5e191791979e5f260d32eb4f703a8 before f803c086399da277b5d0ff36a107d0f162751800 | CNA record |
References
- https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183
- https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d
- https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b
- https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08
- https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60
- https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54
- https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e
- https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800
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.