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netfilter: flowtable: publish GC-visible tuple last

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: publish GC-visible tuple last nf_flow_table_iterate() only treats original-direction tuple nodes as owning entries. Publishing the original node first lets GC observe and free a flow while flow_offload_add() is still inserting the reply node. Publish the reply node first and the original node last so GC never sees a partially installed flow. KASAN can trigger slab-use-after-free read and write reports in the flowtable/rhashtable path (rht_deferred_worker, jhash, flow_offload_del, flow_offload_lookup, etc.).

Announced Source revision 1
Original source ↗

CVE-2026-74746

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-2026-74746

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": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
        "lessThan": "0a00254585827f1695aa2700114af622ea754cfa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
        "lessThan": "be345dcbddb4643a54252b954af974b16eda8f91",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
        "lessThan": "211ee5d998d92a7d548811939c65942d06c146e4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
        "lessThan": "d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
        "lessThan": "972fdf7c4f5c282a239c88fea614b056c33dc025",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
        "lessThan": "d9d3050a70efe217e73a0751e55fdae6a7092620",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
        "lessThan": "d16b71231e65cb05daea2b45701fcf09cef041e7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ac2a66665e231847cab11b8c8e844ce43207dd2e",
        "lessThan": "2014ac62df9d45bb9a004a043e85df7be09ed780",
        "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": "5.10.266",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.217",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.184",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.153",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.105",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.46",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/netfilter/nf_flow_table_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74746

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#34306 · Revision 1
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Publisher date
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