{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98622",
  "modified": "2026-10-19T04:30:01Z",
  "upstream": [
    "CVE-2026-98622"
  ],
  "published": "2026-10-18T15:22:13Z",
  "summary": "net/sched: act_ct: don't WARN on benign flow_offload_alloc() failure",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: don't WARN on benign flow_offload_alloc() failure\n\nflow_offload_alloc() returns NULL when the conntrack entry is dying\n(e.g. raced with a conntrack flush) or when the GFP_ATOMIC allocation\nfails; both are expected under load and neither is a kernel bug. This\npath runs from softirq on every committed packet, so with\npanic_on_warn=1 an unprivileged user can panic the box just by racing\na conntrack flush against a `tc ... action ct commit` classifier.\n\nReproduced with a custom repro under QEMU: a small, fixed set of UDP\nflows through `tc filter ... action ct commit` on lo, raced against\nthreads flooding bare ctnetlink CT_DELETE (flush) requests. Hits\nWARNING: net/sched/act_ct.c:437 (tcf_ct_flow_table_add(), inlined\ninto tcf_ct_act() in this build) within ~15s on the unpatched kernel;\nsame setup is clean on the patched kernel. The fix itself is\nbehavior-preserving: both branches already did `goto err_alloc`\nbefore and after, only the WARN is removed.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.189",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98622"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8fcf3f08834e939b797311742ee72b1e2a08096"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af475f599270e59313552e6c6f3af8507da672b8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/424ba52c0058deeb940d02cba52eb0aeb288db33"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d805560ad69cb266d669341ca01e26bffb0d2c67"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/00734f3684fcec42c319bedfe68a5d357c720b53"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/650787233c2fd6e515a7c5f371019a9fa080ccd2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/47abe7a5c4eb53269aca3506446f851572a059a3"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-18T15:22:13Z"
  }
}