ip6mr: do not clone dst in ip6mr_cache_report()
In the Linux kernel, the following vulnerability has been resolved: ip6mr: do not clone dst in ip6mr_cache_report() IPv6 input attaches a non-refcounted (NOREF) dst to skbs under RCU. When an ingress multicast packet misses MFC lookup, ip6mr_cache_unresolved() places the skb onto the unresolved queue, escaping the receive-side RCU grace period. If the underlying route is deleted and freed, and the MFC queue is later resolved with a wrong parent interface, ip6_mr_forward() invokes ip6mr_cache_report(..., MRT6MSG_WRONGMIF), which executes dst_clone(skb_dst(pkt)) on the freed dst entry, triggering a slab use-after-free. Report packets queued to mroute6_sk (a raw socket) and netlink notifications do not require an attached dst entry. Fix this by: 1. Removing dst_clone() in ip6mr_cache_report() and ensuring report skbs do not hold a dst. 2. Dropping skb_dst before queuing unresolved skbs in ip6mr_cache_unresolved(), matching the fact that multicast forwarding resolves outgoing routes anew via ip6_route_output().
CVE-2026-90111
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-2026-90111
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": "67f415dd29063a5906c560051c00e42dcf01a4dd",
"lessThan": "7f8287f606c8c028d4224e85d95dc448c6d6d623",
"versionType": "git"
},
{
"status": "affected",
"version": "67f415dd29063a5906c560051c00e42dcf01a4dd",
"lessThan": "42ef371466d5648f5c9e8bc219f0af0a2c2bbf8c",
"versionType": "git"
},
{
"status": "affected",
"version": "67f415dd29063a5906c560051c00e42dcf01a4dd",
"lessThan": "f57b0fd1c62e1be274ee154ab7fb8ac4481b7f89",
"versionType": "git"
},
{
"status": "affected",
"version": "67f415dd29063a5906c560051c00e42dcf01a4dd",
"lessThan": "4a674afaae4136c71943aa3e35d433676fd40e8f",
"versionType": "git"
},
{
"status": "affected",
"version": "67f415dd29063a5906c560051c00e42dcf01a4dd",
"lessThan": "235b42b5860189eb8c27c36435ad932cae65a734",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/ip6mr.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/ip6mr.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90111
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #48606 · Revision 1
- Added to Heist Feed
- Publisher date