{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0d76daf2013ce1da20eab5e26bd81d983e1c18fb"
            },
            {
              "fixed": "fb080b6f54835d5d4d11ce3122800e6f0f6689e6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "ec624fe740b416fb68d536b37fb8eef46f90b5c2"
            },
            {
              "fixed": "67d6b00a54446c008f52cf70fc0c2ad0c712f85d"
            },
            {
              "fixed": "2400c4b05d58834b994500a9eec90a37db44187c"
            },
            {
              "fixed": "5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac"
            },
            {
              "fixed": "b3d835407846134b0d54637c0281b39bebef831d"
            },
            {
              "fixed": "f7f45ceb855d9ba1cba594fb3f383255f7013fad"
            },
            {
              "fixed": "9092e15defbe6c7bc241c306093ca9d358a578e7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.15.13"
            },
            {
              "fixed": "5.15.217"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.15.217"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.184"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72057.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: preserve tc_skb_cb across defragmentation\n\ntcf_ct_handle_fragments() calls nf_ct_handle_fragments() without saving\nand restoring skb-\u003ecb. The defrag helper clears IPCB/IP6CB, which aliases\nthe tc_skb_cb/qdisc_skb_cb control buffer. Fragmented traffic through\nact_ct therefore loses qdisc metadata such as pkt_segs and can trigger\nWARN_ON_ONCE() in qdisc_pkt_segs() when panic_on_warn is enabled.\n\nSave and restore the full tc_skb_cb around nf_ct_handle_fragments(),\nmatching the pattern used by ovs_ct_handle_fragments().",
  "id": "CVE-2026-72057",
  "modified": "2026-08-25T03:51:53.608444491Z",
  "published": "2026-08-15T05:52:12.873Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2400c4b05d58834b994500a9eec90a37db44187c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c3ae5f6c7c6de73ea9b6a75154fe4ed343e1bac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67d6b00a54446c008f52cf70fc0c2ad0c712f85d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9092e15defbe6c7bc241c306093ca9d358a578e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3d835407846134b0d54637c0281b39bebef831d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f7f45ceb855d9ba1cba594fb3f383255f7013fad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb080b6f54835d5d4d11ce3122800e6f0f6689e6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72057.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72057"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net/sched: act_ct: preserve tc_skb_cb across defragmentation"
}