CVE-2026-64580 (GCVE-0-2026-64580)
Vulnerability from cvelistv5 – Published: 2026-08-05 08:09 – Updated: 2026-08-19 16:29
VLAI
EPSS
VEX
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
<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.
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
...
Severity
7.8 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
84c4a9dfbf430861e7588d95ae3ff61535dca351 , < 97e032e5733e49471fb73de117ea2ac1ac7c479a
(git)
Affected: 84c4a9dfbf430861e7588d95ae3ff61535dca351 , < df6856c2dda9187601d29b5fbd7a81b3b178cedf (git) Affected: 84c4a9dfbf430861e7588d95ae3ff61535dca351 , < 43de8a49335e611adb271bbd52e84dfbc11fc185 (git) Affected: 84c4a9dfbf430861e7588d95ae3ff61535dca351 , < ff636d7b7cba6dea82ecf580415ea57f2c1a11b6 (git) Affected: 84c4a9dfbf430861e7588d95ae3ff61535dca351 , < e078da1b4e11390cff3201c19a9a1fe70c5b934f (git) Affected: 84c4a9dfbf430861e7588d95ae3ff61535dca351 , < 136992de9bb91871084ae52d172610541c76e4d2 (git) Affected: a7e22d0c0e81dde129a51ee413644124f4b59954 (git) Affected: 01b0d887f67a388fb2a658ee2bdd74e5ba146818 (git) Affected: a98124aac0b5adc5de8ae54f11322781cb4d85c3 (git) Affected: e27b7bee743d921f037b1da6f071237345bef7c1 (git) Affected: 3.0.79 , < 3.1 (semver) Affected: 3.2.46 , < 3.3 (semver) Affected: 3.4.46 , < 3.5 (semver) Affected: 3.9.3 , < 3.10 (semver) |
guessed | |
| Linux | Linux |
Affected:
3.10
Unaffected: 0 , < 3.10 (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
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"product": "Linux",
"programFiles": [
"net/ipv6/xfrm6_policy.c"
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{
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"version": "01b0d887f67a388fb2a658ee2bdd74e5ba146818",
"versionType": "git"
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{
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"version": "a98124aac0b5adc5de8ae54f11322781cb4d85c3",
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"version": "3.9.3",
"versionType": "semver"
}
]
},
{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.10"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1.183",
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},
{
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"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"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"
},
{
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"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
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},
{
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{
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},
{
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},
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},
{
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},
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},
{
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},
{
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},
{
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"versionStartIncluding": "3.9.3",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003eu.dst.dev set. dst_destroy() later calls netdev_put(dst-\u003edev)\nagain, so the same net_device reference is released twice, underflowing\nits refcount (ref_tracker WARNING + \"unregister_netdevice: waiting for\n\u003cdev\u003e to become free\").\n\nClear xdst-\u003eu.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 -\u003edev 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 ..."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is reached on the local IPv6 outbound path (udpv6_sendmsg \u2192 xfrm_lookup \u2192 xfrm6_fill_dst) after configuring XFRM policy/state via netlink or IPV6_XFRM_POLICY; a remote peer cannot drive that configuration or the device state that makes in6_dev_get fail.\nAC:L - An attacker in their own netns can create interfaces, install IPv6 XFRM policy/state, generate matching UDP traffic, and concurrently drop MTU below IPV6_MIN_MTU or unregister the device to clear ip6_ptr, so they control both sides of the window that hits the error path; once entered, the double netdev_put is deterministic.\nPR:L - XFRM configuration requires CAP_NET_ADMIN via netlink_net_capable/sockopt_ns_capable, which is ns_capable() in the netns user_ns, so an unprivileged user obtains it with unshare -Urn rather than real init-namespace root.\nUI:N - No victim action is required; the attacker configures XFRM, manipulates their own netdevs, and sends packets entirely with their own processes.\nS:U - The impact is kernel net_device refcount corruption within the same host kernel authority; this is ordinary local privilege-escalation/DoS territory, not a VM escape or IOMMU/sandbox boundary cross.\nC:H - The leftover dst.dev causes a second netdev_put in dst_destroy, underflowing the net_device refcount and enabling use-after-free of the device object, which per kernel UAF guidance yields a high confidentiality/info-disclosure primitive.\nI:H - A net_device refcount underflow/UAF is heap memory corruption that can be shaped via reuse/spraying into arbitrary write or control-flow hijack, so integrity impact is high.\nA:H - Even without full exploitation, the double put triggers ref_tracker warnings and can oops/panic or hang device unregister (unregister_netdevice waiting for the device to become free), so availability impact is high."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:29:07.038Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/97e032e5733e49471fb73de117ea2ac1ac7c479a"
},
{
"url": "https://git.kernel.org/stable/c/df6856c2dda9187601d29b5fbd7a81b3b178cedf"
},
{
"url": "https://git.kernel.org/stable/c/43de8a49335e611adb271bbd52e84dfbc11fc185"
},
{
"url": "https://git.kernel.org/stable/c/ff636d7b7cba6dea82ecf580415ea57f2c1a11b6"
},
{
"url": "https://git.kernel.org/stable/c/e078da1b4e11390cff3201c19a9a1fe70c5b934f"
},
{
"url": "https://git.kernel.org/stable/c/136992de9bb91871084ae52d172610541c76e4d2"
}
],
"title": "xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-64580",
"datePublished": "2026-08-05T08:09:34.946Z",
"dateReserved": "2026-07-19T15:36:31.798Z",
"dateUpdated": "2026-08-19T16:29:07.038Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-64580",
"date": "2026-10-10",
"epss": "0.00176",
"percentile": "0.06552"
},
"microsoft_vex": {
"current_release_date": "2026-08-09T01:42:32.000Z",
"cve": "CVE-2026-64580",
"id": "msrc_CVE-2026-64580",
"initial_release_date": "2026-08-07T01:19:57.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64580.json",
"version": "2"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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"versionType": "git"
},
{
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{
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{
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"versionType": "git"
},
{
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"version": "e27b7bee743d921f037b1da6f071237345bef7c1",
"versionType": "git"
},
{
"lessThan": "3.1",
"status": "affected",
"version": "3.0.79",
"versionType": "semver"
},
{
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"version": "3.2.46",
"versionType": "semver"
},
{
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"status": "affected",
"version": "3.4.46",
"versionType": "semver"
},
{
"lessThan": "3.10",
"status": "affected",
"version": "3.9.3",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/ipv6/xfrm6_policy.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.10"
},
{
"lessThan": "3.10",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"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-\u003eu.dst.dev set. dst_destroy() later calls netdev_put(dst-\u003edev)\nagain, so the same net_device reference is released twice, underflowing\nits refcount (ref_tracker WARNING + \"unregister_netdevice: waiting for\n\u003cdev\u003e to become free\").\n\nClear xdst-\u003eu.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 -\u003edev 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 ..."
}
],
"id": "CVE-2026-64580",
"lastModified": "2026-08-19T17:20:18.147",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-05T08:16:38.027",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-10-08T17:07:41Z",
"cve": "CVE-2026-64580",
"id": "CVE-2026-64580",
"initial_release_date": "2026-08-06T01:06:14Z",
"product_status:known_affected": "410",
"product_status:recommended": "4",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64580",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64580.json",
"version": "9"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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