Answer in brief
CVE-2026-74597 records a Unknown severity vulnerability in ip6_tunnel: clear skb2->cb[] in ip6ip6_err(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e490d1d85cf5e191791979e5f260d32eb4f703a8 <44fe898df302e91c5ee5acbc71ffa74e78e6c183 || >=e490d1d85cf5e191791979e5f260d32eb4f703a8 <0dadb0620ab65949a8bc2439dd28ea3c942fe87d || >=e490d1d85cf5e191791979e5f260d32eb4f703a8 <b6816536a2990c0db44a26130a03e40b441e829b || >=e490d1d85cf5e191791979e5f260d32eb4f703a8 <64e41736a26f37ab6215bc2e6df125df05aceb08 || >=e490d1d85cf5e191791979e5f260d32eb4f703a8 <484134e1eb07d700a73b1e4bbf3fb503e299be60 || >=e490d1d85cf5e191791979e5f260d32eb4f703a8 <4eb15c465337b18f44716c499cd6ad63eee0ad54 || >=e490d1d85cf5e191791979e5f260d32eb4f703a8 <fbf40faa0414b753212494ad197542002e66ed9e || >=e490d1d85cf5e191791979e5f260d32eb4f703a8 <f803c086399da277b5d0ff36a107d0f162751800 | 44fe898df302e91c5ee5acbc71ffa74e78e6c183, 0dadb0620ab65949a8bc2439dd28ea3c942fe87d, b6816536a2990c0db44a26130a03e40b441e829b, 64e41736a26f37ab6215bc2e6df125df05aceb08, 484134e1eb07d700a73b1e4bbf3fb503e299be60, 4eb15c465337b18f44716c499cd6ad63eee0ad54, fbf40faa0414b753212494ad197542002e66ed9e, f803c086399da277b5d0ff36a107d0f162751800 |
| Linux/Linuxgeneric | 2.6.22 | Not reported |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
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.
Quoted source text, attributed separately from HOL analysis.