HighFix available
netfilter: flowtable: hold reference on ct until flow is released
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: hold reference on ct until flow is released nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from the flowtable datapath. Hold reference on ct until flow is released after rcu grace period. Add rcu_barrier() on module exit path, to ensure pending flow entries are release before module goes away.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.271, 5.15.222, 6.1.189, 6.12.112, 6.18.54, 6.6.158, 7.2.8
- CVEs
- CVE-2026-98320
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 01:41 UTC · Revision 1
Source evidence
netfilter: flowtable: hold reference on ct until flow is released
core-osv · Original sourcePublished 6 Oct 2026, 08:46 UTC
In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: hold reference on ct until flow is released nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from the flowtable datapath. Hold reference on ct until flow is released after rcu grace period. Add rcu_barrier() on module exit path, to ensure pending flow entries are release before module goes away.
osv:CVE-2026-98320
Kernel
Fixed versions: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8
Complete source record
{
"id": "9a9c845b365e7d952ec5d270aaea1cc744e2e4bfabf7a47cae346e986c5ac1d3",
"url": "https://osv.dev/vulnerability/CVE-2026-98320",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "netfilter: flowtable: hold reference on ct until flow is released",
"summary": "In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: hold reference on ct until flow is released nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from the flowtable datapath. Hold reference on ct until flow is released after rcu grace period. Add rcu_barrier() on module exit path, to ensure pending flow entries are release before module goes away.",
"evidence": "osv:CVE-2026-98320",
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"severity": "high",
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"package": {
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"modified": "2026-10-28T02:30:41.332841548Z",
"provider": "osv",
"references": [
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"https://git.kernel.org/stable/c/61c6688be282277c6e91ab286a7acd0ae8681ac6",
"https://git.kernel.org/stable/c/8274cdc5f9c57e17ed77fc4ba76212536c840f25",
"https://git.kernel.org/stable/c/93ff1594be1aad4da364462dd8db050ebcfda2de",
"https://git.kernel.org/stable/c/a43cd2b67b91e943273c913237a7a88c50cdcfbc",
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"https://git.kernel.org/stable/c/e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d",
"https://git.kernel.org/stable/c/eed6997e8dc40593a539fcc722e7ed51b18db86c",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98320.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-98320",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98320.json"
}
},
"related_cves": [
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 509158,
"published_at": "2026-10-06T08:46:14.757+00:00"
}