ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
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.
CVE-2026-74597
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74597
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
"lessThan": "44fe898df302e91c5ee5acbc71ffa74e78e6c183",
"versionType": "git"
},
{
"status": "affected",
"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
"lessThan": "0dadb0620ab65949a8bc2439dd28ea3c942fe87d",
"versionType": "git"
},
{
"status": "affected",
"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
"lessThan": "b6816536a2990c0db44a26130a03e40b441e829b",
"versionType": "git"
},
{
"status": "affected",
"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
"lessThan": "64e41736a26f37ab6215bc2e6df125df05aceb08",
"versionType": "git"
},
{
"status": "affected",
"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
"lessThan": "484134e1eb07d700a73b1e4bbf3fb503e299be60",
"versionType": "git"
},
{
"status": "affected",
"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
"lessThan": "4eb15c465337b18f44716c499cd6ad63eee0ad54",
"versionType": "git"
},
{
"status": "affected",
"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
"lessThan": "fbf40faa0414b753212494ad197542002e66ed9e",
"versionType": "git"
},
{
"status": "affected",
"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8",
"lessThan": "f803c086399da277b5d0ff36a107d0f162751800",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/ip6_tunnel.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.22"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.22",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/ip6_tunnel.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74597
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #33231 · Revision 1
- Added to Heist Feed
- Publisher date