CVE-2026-74597
Description
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.
How to fix
- Linux Linux44fe898df302e91c5ee5acbc71ffa74e78e6c183, 0dadb0620ab65949a8bc2439dd28ea3c942fe87d, b6816536a2990c0db44a26130a03e40b441e829b, 64e41736a26f37ab6215bc2e6df125df05aceb08, 484134e1eb07d700a73b1e4bbf3fb503e299be60, 4eb15c465337b18f44716c499cd6ad63eee0ad54, fbf40faa0414b753212494ad197542002e66ed9e, f803c086399da277b5d0ff36a107d0f162751800 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | e490d1d85cf5e191791979e5f260d32eb4f703a8 ≤ v < 44fe898df302e91c5ee5acbc71ffa74e78e6c183, e490d1d85cf5e191791979e5f260d32eb4f703a8 ≤ v < 0dadb0620ab65949a8bc2439dd28ea3c942fe87d, e490d1d85cf5e191791979e5f260d32eb4f703a8 ≤ v < b6816536a2990c0db44a26130a03e40b441e829b, e490d1d85cf5e191791979e5f260d32eb4f703a8 ≤ v < 64e41736a26f37ab6215bc2e6df125df05aceb08, e490d1d85cf5e191791979e5f260d32eb4f703a8 ≤ v < 484134e1eb07d700a73b1e4bbf3fb503e299be60, e490d1d85cf5e191791979e5f260d32eb4f703a8 ≤ v < 4eb15c465337b18f44716c499cd6ad63eee0ad54, e490d1d85cf5e191791979e5f260d32eb4f703a8 ≤ v < fbf40faa0414b753212494ad197542002e66ed9e, e490d1d85cf5e191791979e5f260d32eb4f703a8 ≤ v < f803c086399da277b5d0ff36a107d0f162751800, 2.6.22 | 44fe898df302e91c5ee5acbc71ffa74e78e6c183, 0dadb0620ab65949a8bc2439dd28ea3c942fe87d, b6816536a2990c0db44a26130a03e40b441e829b, 64e41736a26f37ab6215bc2e6df125df05aceb08, 484134e1eb07d700a73b1e4bbf3fb503e299be60, 4eb15c465337b18f44716c499cd6ad63eee0ad54, fbf40faa0414b753212494ad197542002e66ed9e, f803c086399da277b5d0ff36a107d0f162751800 |
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