CVE-2026-64580
Estado: RecibidaAlta (7.8)—
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 <dev> 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.
Detalles técnicos trazas, registros y código del informe original
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 ...
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.18%
- Percentil entre todas las CVEs puntuadas: 6
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1499.004Application or System Exploitationimpact75 %
Vulnerabilidad local (AV:L/PR:L) en kernel Linux que causa doble liberación de referencia de dispositivo, provocando underflow de refcount y DoS (ref_tracker WARNING, waiting for device to become free).
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- 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
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-64580",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Secondary",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.8,
"attackVector": "LOCAL",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "LOW",
"confidentialityImpact": "HIGH"
},
"impactScore": 5.9,
"exploitabilityScore": 1.8
}
]
},
"affected": [
{
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"affectedData": [
{
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{
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{
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{
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{
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{
"status": "affected",
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},
{
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"lessThan": "3.10",
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],
"programFiles": [
"net/ipv6/xfrm6_policy.c"
],
"defaultStatus": "unaffected"
},
{
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"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.10",
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},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver",
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},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
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},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/xfrm6_policy.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-05T08:16:38.027",
"references": [
{
"url": "https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/97e032e5733e49471fb73de117ea2ac1ac7c479a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()\n\nOn the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst()\nreleases the device reference with netdev_put() but leaves\nxdst->u.dst.dev set. dst_destroy() later calls netdev_put(dst->dev)\nagain, so the same net_device reference is released twice, underflowing\nits refcount (ref_tracker WARNING + \"unregister_netdevice: waiting for\n<dev> to become free\").\n\nClear xdst->u.dst.dev after the netdev_put(), the same way the XFRM\ndevice-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in\nnet/xfrm/xfrm_device.c NULL ->dev when releasing the reference on error.\n\n ref_tracker: reference already released.\n ref_tracker: allocated in:\n xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86)\n ...\n udpv6_sendmsg (net/ipv6/udp.c:1696)\n ...\n ref_tracker: freed in:\n xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90)\n ...\n WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780\n dst_destroy (net/core/dst.c:115)\n rcu_core\n handle_softirqs\n ..."
}
],
"lastModified": "2026-08-19T17:20:18.147",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}