{
  "affected": [
    {
      "ranges": [
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          "events": [
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              "introduced": "172ba7d46c202e679f3ccb10264c67416aaeb1c4"
            },
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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          "type": "GIT"
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              "introduced": "73f7da5fd124f2cda9161e2e46114915e6e82e97"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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            {
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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            },
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            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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        {
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            },
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            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.15.212"
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          ],
          "type": "ECOSYSTEM"
        },
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              "introduced": "5.16.0"
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          ],
          "type": "ECOSYSTEM"
        },
        {
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              "introduced": "6.2.0"
            },
            {
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            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
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              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
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      ]
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  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64530.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle\n\ntcf_classify() can return TC_ACT_CONSUMED while the skb is held by the\ndefragmentation engine (e.g. act_ct on out-of-order fragments). When\nthat happens the skb is no longer owned by the caller and must not be\ntouched again.\n\ntcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the\nswitch and returned the skb to the caller as if classification had\npassed. The only qdisc that wires up qevents today is RED, via three call sites\n(qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop)\nred_enqueue() was continuing to operate on an skb it no longer owns  in this\ncase -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.\n\n  tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10\n  tc filter add block 10 ... action ct\n\n  (with ct defrag enabled and traffic that produces out-of-order\n  fragments, e.g. a fragmented UDP stream)\n\nHandle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress\nand egress fast paths do: treat it as stolen and return NULL without\ntouching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be\ndropped/freed here, as it is no longer owned by us.",
  "id": "CVE-2026-64530",
  "modified": "2026-07-28T03:56:03.391653429Z",
  "published": "2026-07-26T06:28:42.970Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64530.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64530"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle"
}