Strix
57.4K

CVE-2026-74597

Unknown

Last modified

CVE-2026-74597 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= e490d1d85cf5e191791979e5f260d32eb4f703a8, < 44fe898df302e91c5ee5acbc71ffa74e78e6c183; >= e490d1d85cf5e191791979e5f260d32eb4f703a8, < 0dadb0620ab65949a8bc2439dd28ea3c942fe87d; >= e490d1d85cf5e191791979e5f260d32eb4f703a8, < b6816536a2990c0db44a26130a03e40b441e829b; >= e490d1d85cf5e191791979e5f260d32eb4f703a8, < 64e41736a26f37ab6215bc2e6df125df05aceb08; >= e490d1d85cf5e191791979e5f260d32eb4f703a8, < 484134e1eb07d700a73b1e4bbf3fb503e299be60; >= e490d1d85cf5e191791979e5f260d32eb4f703a8, < 4eb15c465337b18f44716c499cd6ad63eee0ad54; >= e490d1d85cf5e191791979e5f260d32eb4f703a8, < fbf40faa0414b753212494ad197542002e66ed9e; >= e490d1d85cf5e191791979e5f260d32eb4f703a8, < f803c086399da277b5d0ff36a107d0f162751800
LinuxLinux2.6.22

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74597?
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 severe is CVE-2026-74597?
Severity scoring for CVE-2026-74597 is pending analysis.
How do I fix CVE-2026-74597?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-74597?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST