{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1abf272022cf1d18469405f47b4ec49c6a3125db"
            },
            {
              "fixed": "57f94ac7e953eece5ed4819605a18f3cdfc63dcc"
            },
            {
              "fixed": "942813276edeb1741fa5b0a73471beb4e495fa08"
            },
            {
              "fixed": "cc707a4fd4c3b6ab2722e06bc359aa010e13d408"
            },
            {
              "fixed": "4a09f72007201c9f667dc47f64517ec23eea65e5"
            },
            {
              "fixed": "9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e"
            },
            {
              "fixed": "a208c3e1232997e9317887294c20008dfcb75449"
            },
            {
              "fixed": "415ea0c973c754b9f375225807810eb9045f4293"
            },
            {
              "fixed": "1a280dd4bd1d616a01d6ffe0de284c907b555504"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.15.0"
            },
            {
              "fixed": "5.10.253"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.203"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.168"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.134"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31422.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flow: fix NULL pointer dereference on shared blocks\n\nflow_change() calls tcf_block_q() and dereferences q-\u003ehandle to derive\na default baseclass.  Shared blocks leave block-\u003eq NULL, causing a NULL\nderef when a flow filter without a fully qualified baseclass is created\non a shared block.\n\nCheck tcf_block_shared() before accessing block-\u003eq and return -EINVAL\nfor shared blocks.  This avoids the null-deref shown below:\n\n=======================================================================\nKASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\nRIP: 0010:flow_change (net/sched/cls_flow.c:508)\nCall Trace:\n tc_new_tfilter (net/sched/cls_api.c:2432)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:6980)\n [...]\n=======================================================================",
  "id": "CVE-2026-31422",
  "modified": "2026-07-08T05:38:26.566638453Z",
  "published": "2026-04-13T13:40:25.911Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a280dd4bd1d616a01d6ffe0de284c907b555504"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/415ea0c973c754b9f375225807810eb9045f4293"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a09f72007201c9f667dc47f64517ec23eea65e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57f94ac7e953eece5ed4819605a18f3cdfc63dcc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/942813276edeb1741fa5b0a73471beb4e495fa08"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a208c3e1232997e9317887294c20008dfcb75449"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc707a4fd4c3b6ab2722e06bc359aa010e13d408"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31422.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31422"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "net/sched: cls_flow: fix NULL pointer dereference on shared blocks"
}