{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "879af96ffd72706c6e3278ea6b45b0b0e37ec5d7"
            },
            {
              "fixed": "c99ca049e910d61ddbd28cc2c47242f2bfbb4970"
            },
            {
              "fixed": "e2a56441233131fe18a76001de347ecda217e40c"
            },
            {
              "fixed": "3876318ea54e83eb70982b8280a3c5e4e32269bf"
            },
            {
              "fixed": "4edbcacca09f92b85d3951b6add11894b20a84bc"
            },
            {
              "fixed": "03b743586a2469744e96e9c1015096d07240935d"
            },
            {
              "fixed": "89c103d702b25ceb2d097faf854deb47b53b17ff"
            },
            {
              "fixed": "e82d8cc4321c373dc46e741cd2dfdaa7921fddb7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.15.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64545.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet, bpf: check master for NULL in xdp_master_redirect()\n\nxdp_master_redirect() dereferences the result of\nnetdev_master_upper_dev_get_rcu() without a NULL check, but that helper\nreturns NULL when the receiving device has no upper-master adjacency.\n\nThe reach guard only checks netif_is_bond_slave(). On bond slave release\nbond_upper_dev_unlink() drops the upper-master adjacency before clearing\nIFF_SLAVE, so an XDP_TX reaching xdp_master_redirect() in that window\nstill passes netif_is_bond_slave() while master is already NULL, and\nfaults on master-\u003eflags at offset 0xb0:\n\n  BUG: kernel NULL pointer dereference, address: 00000000000000b0\n  RIP: 0010:xdp_master_redirect (net/core/filter.c:4432)\n  Call Trace:\n   xdp_master_redirect (net/core/filter.c:4432)\n   bpf_prog_run_generic_xdp (include/net/xdp.h:700)\n   do_xdp_generic (net/core/dev.c:5608)\n   __netif_receive_skb_one_core (net/core/dev.c:6204)\n   process_backlog (net/core/dev.c:6319)\n   __napi_poll (net/core/dev.c:7729)\n   net_rx_action (net/core/dev.c:7792)\n   handle_softirqs (kernel/softirq.c:622)\n   __dev_queue_xmit (include/linux/bottom_half.h:33)\n   packet_sendmsg (net/packet/af_packet.c:3082)\n   __sys_sendto (net/socket.c:2252)\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nThe missing check dates back to the original code; commit 1921f91298d1\n(\"net, bpf: fix null-ptr-deref in xdp_master_redirect() for down master\")\nlater added the master-\u003eflags read where the fault now lands but kept the\nunconditional deref. Check master for NULL before use; a NULL master is\ntreated the same as one that is not up.",
  "id": "CVE-2026-64545",
  "modified": "2026-08-18T03:31:23.280172188Z",
  "published": "2026-07-27T20:10:36.659Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/03b743586a2469744e96e9c1015096d07240935d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3876318ea54e83eb70982b8280a3c5e4e32269bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4edbcacca09f92b85d3951b6add11894b20a84bc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89c103d702b25ceb2d097faf854deb47b53b17ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c99ca049e910d61ddbd28cc2c47242f2bfbb4970"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e2a56441233131fe18a76001de347ecda217e40c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e82d8cc4321c373dc46e741cd2dfdaa7921fddb7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64545.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64545"
    },
    {
      "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:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net, bpf: check master for NULL in xdp_master_redirect()"
}