{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "42f39036cda808d3de243192a2cf5125f12f3047"
            },
            {
              "fixed": "8fda5174286119addd28473fb2ec5bdf521c05a8"
            },
            {
              "fixed": "7db3e4e03032261b1b519341123fc30d995478ca"
            },
            {
              "fixed": "4764953c4b47585eb72797b216b63a831dc0c7e6"
            },
            {
              "fixed": "4510d140524ca7d6e772db962e013f26f09a63b1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "6.12.91"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.33"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53014.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir\n\nIn tcf_blockcast_redir(), when iterating block ports to redirect\npackets to multiple devices, the mac_header_xmit flag is queried\nfrom the wrong device. The loop sends to dev_prev but queries\ndev_is_mac_header_xmit(dev) — which is the NEXT device in the\niteration, not the one being sent to.\n\nThis causes tcf_mirred_to_dev() to make incorrect decisions about\nwhether to push or pull the MAC header. When the block contains\nmixed device types (e.g., an ethernet veth and a tunnel device),\nintermediate devices get the wrong mac_header_xmit flag, leading to\nskb header corruption. In the worst case, skb_push_rcsum with an\nincorrect mac_len can exhaust headroom and panic.\n\nThe last device in the loop is handled correctly (line 365-366 uses\ndev_is_mac_header_xmit(dev_prev)), confirming this is a copy-paste\noversight for the intermediate devices.\n\nFix by using dev_prev instead of dev for the mac_header_xmit query,\nconsistent with the device actually being sent to.",
  "id": "CVE-2026-53014",
  "modified": "2026-08-12T03:51:33.160805144Z",
  "published": "2026-06-24T16:29:24.605Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4510d140524ca7d6e772db962e013f26f09a63b1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4764953c4b47585eb72797b216b63a831dc0c7e6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7db3e4e03032261b1b519341123fc30d995478ca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fda5174286119addd28473fb2ec5bdf521c05a8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53014.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53014"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/sched: act_mirred: fix wrong device for mac_header_xmit check in tcf_blockcast_redir"
}