Answer in brief
CVE-2026-74597 records a Critical severity (CVSS 9.8) 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.
CVSS is 9.8. 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 25, 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.