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netfilter: flowtable: hold reference on ct until flow is released

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98320

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98320

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
        "lessThan": "93ff1594be1aad4da364462dd8db050ebcfda2de",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
        "lessThan": "eed6997e8dc40593a539fcc722e7ed51b18db86c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
        "lessThan": "61c6688be282277c6e91ab286a7acd0ae8681ac6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
        "lessThan": "a43cd2b67b91e943273c913237a7a88c50cdcfbc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
        "lessThan": "8274cdc5f9c57e17ed77fc4ba76212536c840f25",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
        "lessThan": "12c1ac230f4ca16e0017b62a963ab75e0b48074f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
        "lessThan": "d9e6175a3ee48209ee65f294fc567b4e16b29b74",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0ff90b6c20340e57616a51ae1a1bf18156d6638a",
        "lessThan": "e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_flow_table_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_flow_table_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98320

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#38399 · Revision 1
Added to Heist Feed
Publisher date
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