xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
In the Linux kernel, the following vulnerability has been resolved: xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst() On the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst() releases the device reference with netdev_put() but leaves xdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev) again, so the same net_device reference is released twice, underflowing its refcount (ref_tracker WARNING + "unregister_netdevice: waiting for to become free"). Clear xdst->u.dst.dev after the netdev_put(), the same way the XFRM device-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in net/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error. ref_tracker: reference already released. ref_tracker: allocated in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86) ... udpv6_sendmsg (net/ipv6/udp.c:1696) ... ref_tracker: freed in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90) ... WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780 dst_destroy (net/core/dst.c:115) rcu_core handle_softirqs ...
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.1.183, 6.12.101, 6.18.42, 6.6.148, 7.1.6
- CVEs
- CVE-2026-64580
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 14:09 UTC · Revision 1
Source evidence
xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()
core-osv · Original sourcePublished 5 Aug 2026, 08:09 UTC
In the Linux kernel, the following vulnerability has been resolved: xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst() On the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst() releases the device reference with netdev_put() but leaves xdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev) again, so the same net_device reference is released twice, underflowing its refcount (ref_tracker WARNING + "unregister_netdevice: waiting for to become free"). Clear xdst->u.dst.dev after the netdev_put(), the same way the XFRM device-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in net/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error. ref_tracker: reference already released. ref_tracker: allocated in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86) ... udpv6_sendmsg (net/ipv6/udp.c:1696) ... ref_tracker: freed in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90) ... WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780 dst_destroy (net/core/dst.c:115) rcu_core handle_softirqs ...
osv:CVE-2026-64580
Kernel
Fixed versions: 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6
Complete source record
{
"id": "031c037e5259601e1accec327db40bfb385b75b2e335f0a380a7c13feac725a9",
"url": "https://osv.dev/vulnerability/CVE-2026-64580",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()",
"summary": "In the Linux kernel, the following vulnerability has been resolved: xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst() On the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst() releases the device reference with netdev_put() but leaves xdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev) again, so the same net_device reference is released twice, underflowing its refcount (ref_tracker WARNING + \"unregister_netdevice: waiting for to become free\"). Clear xdst->u.dst.dev after the netdev_put(), the same way the XFRM device-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in net/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error. ref_tracker: reference already released. ref_tracker: allocated in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86) ... udpv6_sendmsg (net/ipv6/udp.c:1696) ... ref_tracker: freed in: xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90) ... WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780 dst_destroy (net/core/dst.c:115) rcu_core handle_softirqs ...",
"evidence": "osv:CVE-2026-64580",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.1.183",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.148",
"evidence": "/affected/1/ranges"
},
{
"value": "6.12.101",
"evidence": "/affected/1/ranges"
},
{
"value": "6.18.42",
"evidence": "/affected/1/ranges"
},
{
"value": "7.1.6",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "CVE-2026-64580",
"aliases": [
"CVE-2026-64580"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "84c4a9dfbf430861e7588d95ae3ff61535dca351"
},
{
"fixed": "97e032e5733e49471fb73de117ea2ac1ac7c479a"
},
{
"fixed": "df6856c2dda9187601d29b5fbd7a81b3b178cedf"
},
{
"fixed": "43de8a49335e611adb271bbd52e84dfbc11fc185"
},
{
"fixed": "ff636d7b7cba6dea82ecf580415ea57f2c1a11b6"
},
{
"fixed": "e078da1b4e11390cff3201c19a9a1fe70c5b934f"
},
{
"fixed": "136992de9bb91871084ae52d172610541c76e4d2"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "3.0.79"
},
{
"fixed": "3.1"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "3.2.46"
},
{
"fixed": "3.3"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "3.4.46"
},
{
"fixed": "3.5"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "3.9.3"
},
{
"fixed": "3.10"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "a7e22d0c0e81dde129a51ee413644124f4b59954"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "01b0d887f67a388fb2a658ee2bdd74e5ba146818"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "a98124aac0b5adc5de8ae54f11322781cb4d85c3"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "e27b7bee743d921f037b1da6f071237345bef7c1"
}
]
}
],
"versions": [
"v3.0.101",
"v3.0.100",
"v3.0.99",
"v3.0.98",
"v3.0.97",
"v3.0.96",
"v3.0.95",
"v3.0.94",
"v3.0.93",
"v3.0.92",
"v3.0.91",
"v3.0.90",
"v3.0.89",
"v3.0.88",
"v3.0.87",
"v3.0.86",
"v3.0.85",
"v3.0.84",
"v3.0.83",
"v3.0.82",
"v3.0.81",
"v3.0.80",
"v3.0.79",
"v3.2.102",
"v3.2.101",
"v3.2.100",
"v3.2.99",
"v3.2.98",
"v3.2.97",
"v3.2.96",
"v3.2.95",
"v3.2.94",
"v3.2.93",
"v3.2.92",
"v3.2.91",
"v3.2.90",
"v3.2.89",
"v3.2.88",
"v3.2.87",
"v3.2.86",
"v3.2.85",
"v3.2.84",
"v3.2.83",
"v3.2.82",
"v3.2.81",
"v3.2.80",
"v3.2.79",
"v3.2.78",
"v3.2.77",
"v3.2.76",
"v3.2.75",
"v3.2.74",
"v3.2.73",
"v3.2.72",
"v3.2.71",
"v3.2.70",
"v3.2.69",
"v3.2.68",
"v3.2.67",
"v3.2.66",
"v3.2.65",
"v3.2.64",
"v3.2.63",
"v3.2.62",
"v3.2.61",
"v3.2.60",
"v3.2.59",
"v3.2.58",
"v3.2.57",
"v3.2.56",
"v3.2.55",
"v3.2.54",
"v3.2.53",
"v3.2.52",
"v3.2.51",
"v3.2.50",
"v3.2.49",
"v3.2.48",
"v3.2.47",
"v3.2.46",
"v3.4.113",
"v3.4.112",
"v3.4.111",
"v3.4.110",
"v3.4.109",
"v3.4.108",
"v3.4.107",
"v3.4.106",
"v3.4.105",
"v3.4.104",
"v3.4.103",
"v3.4.102",
"v3.4.101",
"v3.4.100",
"v3.4.99",
"v3.4.98",
"v3.4.97",
"v3.4.96",
"v3.4.95",
"v3.4.94",
"v3.4.93",
"v3.4.92",
"v3.4.91",
"v3.4.90",
"v3.4.89",
"v3.4.88",
"v3.4.87",
"v3.4.86",
"v3.4.85",
"v3.4.84",
"v3.4.83",
"v3.4.82",
"v3.4.81",
"v3.4.80",
"v3.4.79",
"v3.4.78",
"v3.4.77",
"v3.4.76",
"v3.4.75",
"v3.4.74",
"v3.4.73",
"v3.4.72",
"v3.4.71",
"v3.4.70",
"v3.4.69",
"v3.4.68",
"v3.4.67",
"v3.4.66",
"v3.4.65",
"v3.4.64",
"v3.4.63",
"v3.4.62",
"v3.4.61",
"v3.4.60",
"v3.4.59",
"v3.4.58",
"v3.4.57",
"v3.4.56",
"v3.4.55",
"v3.4.54",
"v3.4.53",
"v3.4.52",
"v3.4.51",
"v3.4.50",
"v3.4.49",
"v3.4.48",
"v3.4.47",
"v3.4.46",
"v3.9.11",
"v3.9.10",
"v3.9.9",
"v3.9.8",
"v3.9.7",
"v3.9.6",
"v3.9.5",
"v3.9.4",
"v3.9.3"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64580.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "3.10.0"
},
{
"fixed": "6.1.183"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.148"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
},
{
"fixed": "6.12.101"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.18.42"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
},
{
"fixed": "7.1.6"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64580.json"
}
}
],
"modified": "2026-10-28T02:30:36.081360350Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2",
"https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185",
"https://git.kernel.org/stable/c/97e032e5733e49471fb73de117ea2ac1ac7c479a",
"https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf",
"https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f",
"https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64580.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-64580",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64580.json"
}
},
"related_cves": [
{
"value": "CVE-2026-64580",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 503508,
"published_at": "2026-08-05T08:09:34.946+00:00"
}