ip6_tunnel: clear skb2->cb[] in ip6ip6_err()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74597
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:32 UTC
Updated2026-08-22 16:16:32 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e490d1d85cf5e191791979e5f260d32eb4f703a8 44fe898df302e91c5ee5acbc71ffa74e78e6c183 git Not specified
CNA Linux Linux affected e490d1d85cf5e191791979e5f260d32eb4f703a8 0dadb0620ab65949a8bc2439dd28ea3c942fe87d git Not specified
CNA Linux Linux affected e490d1d85cf5e191791979e5f260d32eb4f703a8 b6816536a2990c0db44a26130a03e40b441e829b git Not specified
CNA Linux Linux affected e490d1d85cf5e191791979e5f260d32eb4f703a8 64e41736a26f37ab6215bc2e6df125df05aceb08 git Not specified
CNA Linux Linux affected e490d1d85cf5e191791979e5f260d32eb4f703a8 484134e1eb07d700a73b1e4bbf3fb503e299be60 git Not specified
CNA Linux Linux affected e490d1d85cf5e191791979e5f260d32eb4f703a8 4eb15c465337b18f44716c499cd6ad63eee0ad54 git Not specified
CNA Linux Linux affected e490d1d85cf5e191791979e5f260d32eb4f703a8 fbf40faa0414b753212494ad197542002e66ed9e git Not specified
CNA Linux Linux affected e490d1d85cf5e191791979e5f260d32eb4f703a8 f803c086399da277b5d0ff36a107d0f162751800 git Not specified
CNA Linux Linux affected 2.6.22 Not specified
CNA Linux Linux unaffected 2.6.22 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.152 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.104 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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