{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98320",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98320"
  ],
  "published": "2026-10-06T08:47:10Z",
  "summary": "netfilter: flowtable: hold reference on ct until flow is released",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable: hold reference on ct until flow is released\n\nnf_ct_put() releases the ct->ext area inmediately, the rcu typesafe\nsemantics also allow to refer to the wrong conntrack from the flowtable\ndatapath. Hold reference on ct until flow is released after rcu grace\nperiod.\n\nAdd rcu_barrier() on module exit path, to ensure pending flow entries\nare release before module goes away.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98320"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/93ff1594be1aad4da364462dd8db050ebcfda2de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eed6997e8dc40593a539fcc722e7ed51b18db86c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/61c6688be282277c6e91ab286a7acd0ae8681ac6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a43cd2b67b91e943273c913237a7a88c50cdcfbc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8274cdc5f9c57e17ed77fc4ba76212536c840f25"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/12c1ac230f4ca16e0017b62a963ab75e0b48074f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d9e6175a3ee48209ee65f294fc567b4e16b29b74"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e75a9fa1d44bcbd66ea02e8781bcca6ea4076e0d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-07T06:50:27Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The freed ct is reached from nf_flow_offload_forward() (nf_ct_acct_update/flow_offload_teardown on flow->ct) but freeing it needs the conntrack killed (nf_ct_is_dying) and flow_offload_del() run; a remote peer only supplies forwarded packets and cannot kill an offloaded ct, so the full trigger needs local nftables/ctnetlink access.\nAC:L - The attacker drives every side of the race: they flood packets through their own flowtable, delete the ct via ctnetlink, and force nf_flow_offload_gc_step()->flow_offload_del() at once by downing the veth (nf_flow_table_gc_cleanup flush_delayed_work). The window is narrow but can be retried indefinitely.\nPR:L - Creating the nftables flowtable, adding veth forwarding and sending IPCTNL_MSG_CT_DELETE need only CAP_NET_ADMIN in a network namespace, which an unprivileged user gets via unshare -Urn.\nUI:N - No victim action is needed; the attacker sets up the flowtable, the traffic and the conntrack/flow teardown entirely within their own namespace.\nS:U - Memory corruption in the host kernel's netfilter flowtable/conntrack objects yields kernel privilege escalation within the same authority; no VM or hardware boundary is crossed.\nC:H - flow_offload_free() dropped the ct reference before the RCU grace period, so in-flight readers dereference ct->ext after nf_conntrack_free() has kfree'd it, or a recycled SLAB_TYPESAFE_BY_RCU nf_conn now owned by another connection - a use-after-free that can be groomed to leak kernel memory.\nI:H - The stale reader writes freed or reused memory: nf_ct_acct_add() does atomic64_add into the freed ct->ext counters, and flow_offload_teardown()/flow_offload_fixup_ct() modify status/timeout of a recycled conntrack, giving heap-corruption primitives.\nA:H - The use-after-free on ct->ext and recycled nf_conn objects in the forwarding softirq can corrupt the slab and crash the kernel."
    }
  }
}