{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8605330aac5a5785630aec8f64378a54891937cc"
            },
            {
              "fixed": "24a0d548d3a765cd4558224e4f8e06e14cba26e3"
            },
            {
              "fixed": "71ff5cdd5da61d0438e902aa0fd68c28bc901abe"
            },
            {
              "fixed": "ad9a0374ee6d11048e1f74cd5180bad58b9848b4"
            },
            {
              "fixed": "b903e9b5629ec8dd6db92174070045bf81ad7060"
            },
            {
              "fixed": "e0665b2a8e90bb08bd205062c75662b502d31797"
            },
            {
              "fixed": "3dde4fb941fa5649ab809f6cd3e20e0c424a4e31"
            },
            {
              "fixed": "eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a"
            },
            {
              "fixed": "1ee90b77b727df903033db873c75caac5c27ec98"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "cdaf15b43bd31003220cb080bcbbd57787a2fca9"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "4.10.14"
            },
            {
              "fixed": "4.11"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.11.0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53223.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: guard timestamp cmsgs to real error queue skbs\n\nskb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb\nfrom sk_error_queue. That assumption is not true for AF_PACKET sockets:\noutgoing packet taps are also delivered to packet sockets with\nskb-\u003epkt_type == PACKET_OUTGOING, but their skb-\u003ecb is owned by AF_PACKET\ninstead of struct sock_exterr_skb.\n\nIf such an skb is received with timestamping enabled, the generic\ntimestamp cmsg path can read AF_PACKET control-buffer state as\nsock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop\ncounter overlaps opt_stats. An odd drop count makes the path emit\nSCM_TIMESTAMPING_OPT_STATS with skb-\u003elen and skb-\u003edata. For non-linear\nskbs this copies past the linear head and can trigger hardened usercopy or\ndisclose adjacent heap contents.\n\nKeep skb_is_err_queue() local to net/socket.c, but make it verify that\nthe PACKET_OUTGOING marker is paired with the sock_rmem_free destructor\ninstalled by sock_queue_err_skb(). AF_PACKET receive skbs use normal\nreceive ownership and no longer pass as error-queue skbs, while legitimate\nsk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free\nownership.",
  "id": "CVE-2026-53223",
  "modified": "2026-07-08T05:38:14.577178171Z",
  "published": "2026-06-25T08:39:24.588Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ee90b77b727df903033db873c75caac5c27ec98"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24a0d548d3a765cd4558224e4f8e06e14cba26e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3dde4fb941fa5649ab809f6cd3e20e0c424a4e31"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71ff5cdd5da61d0438e902aa0fd68c28bc901abe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad9a0374ee6d11048e1f74cd5180bad58b9848b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b903e9b5629ec8dd6db92174070045bf81ad7060"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e0665b2a8e90bb08bd205062c75662b502d31797"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53223.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53223"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "net: guard timestamp cmsgs to real error queue skbs"
}