FKIE_CVE-2026-98251
Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-07 07:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
openvswitch: avoid reallocating confirmed conntrack labels
ovs_ct_get_conn_labels() adds the labels extension when a conntrack
entry does not have one. Confirmed conntracks can be read locklessly,
so adding an extension may reallocate and free the extension block
while another CPU accesses it.
Only add the extension for unconfirmed conntracks. A confirmed
conntrack without labels now fails the caller's label operation instead
of reallocating its extension storage.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/openvswitch/conntrack.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4371d79ea74407fb992c985b1f94391e35bb8289",
"status": "affected",
"version": "c2ac667358708d7cce64c78f58af6adf4c1e848b",
"versionType": "git"
},
{
"lessThan": "7ff688aceada1160331a789385ea146f62fbddf7",
"status": "affected",
"version": "c2ac667358708d7cce64c78f58af6adf4c1e848b",
"versionType": "git"
},
{
"lessThan": "05eab8dced6bf4d3009a6eeee16ddac99047dc83",
"status": "affected",
"version": "c2ac667358708d7cce64c78f58af6adf4c1e848b",
"versionType": "git"
},
{
"lessThan": "579d87ec1e1e85729a6cb2c25961e58beb78640c",
"status": "affected",
"version": "c2ac667358708d7cce64c78f58af6adf4c1e848b",
"versionType": "git"
},
{
"lessThan": "2e6dd889c325abf23821e1459c3ffef59b7f0009",
"status": "affected",
"version": "c2ac667358708d7cce64c78f58af6adf4c1e848b",
"versionType": "git"
},
{
"lessThan": "d16f089bd700f45d720ce989d5495e1dc3be0cf8",
"status": "affected",
"version": "c2ac667358708d7cce64c78f58af6adf4c1e848b",
"versionType": "git"
},
{
"lessThan": "8c9fcc6c33950d3db551af664d1fd3d998bfee56",
"status": "affected",
"version": "c2ac667358708d7cce64c78f58af6adf4c1e848b",
"versionType": "git"
},
{
"lessThan": "3f118c8217c109fd13ca61caa301d72c483897ef",
"status": "affected",
"version": "c2ac667358708d7cce64c78f58af6adf4c1e848b",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/openvswitch/conntrack.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.3"
},
{
"lessThan": "4.3",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc4",
"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\nopenvswitch: avoid reallocating confirmed conntrack labels\n\novs_ct_get_conn_labels() adds the labels extension when a conntrack\nentry does not have one. Confirmed conntracks can be read locklessly,\nso adding an extension may reallocate and free the extension block\nwhile another CPU accesses it.\n\nOnly add the extension for unconfirmed conntracks. A confirmed\nconntrack without labels now fails the caller\u0027s label operation instead\nof reallocating its extension storage."
}
],
"id": "CVE-2026-98251",
"lastModified": "2026-10-07T07:17:06.237",
"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": "2026-10-06T09:18:13.567",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/05eab8dced6bf4d3009a6eeee16ddac99047dc83"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2e6dd889c325abf23821e1459c3ffef59b7f0009"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3f118c8217c109fd13ca61caa301d72c483897ef"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/4371d79ea74407fb992c985b1f94391e35bb8289"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/579d87ec1e1e85729a6cb2c25961e58beb78640c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7ff688aceada1160331a789385ea146f62fbddf7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/8c9fcc6c33950d3db551af664d1fd3d998bfee56"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d16f089bd700f45d720ce989d5495e1dc3be0cf8"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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Sightings
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Nomenclature
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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.
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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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