netfilter: bpf: defer hook memory release until rcu readers are done

{
  "id": "27f3f5bd77aa0ca2755d683d4a28548d2aa03d65b80643b21c7b116791a9f83f",
  "url": "https://osv.dev/vulnerability/CVE-2026-23412",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netfilter: bpf: defer hook memory release until rcu readers are done",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: netfilter: bpf: defer hook memory release until rcu readers are done Yiming Qian reports UaF when concurrent process is dumping hooks via nfnetlink_hooks: BUG: KASAN: slab-use-after-free in nfnl_hook_dump_one.isra.0+0xe71/0x10f0 Read of size 8 at addr ffff888003edbf88 by task poc/79 Call Trace: nfnl_hook_dump_one.isra.0+0xe71/0x10f0 netlink_dump+0x554/0x12b0 nfnl_hook_get+0x176/0x230 [..] Defer release until after concurrent readers have completed.",
    "evidence": "osv:CVE-2026-23412",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.130",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.78",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.20",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-23412",
      "aliases": [
        "CVE-2026-23412"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "84601d6ee68ae820dec97450934797046d62db4b"
                },
                {
                  "fixed": "d016c216bc75c45128160593a77b864a04dbe7c0"
                },
                {
                  "fixed": "cb2bf5efdb02a2a59faf603604a1066e8266f349"
                },
                {
                  "fixed": "c25e0dec366ae99b7264324ce3c7cbaea34691f9"
                },
                {
                  "fixed": "54244d54a971c26a0cd0a9073460ff71f3c51b32"
                },
                {
                  "fixed": "24f90fa3994b992d1a09003a3db2599330a5232a"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23412.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.6.130"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.78"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.20"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23412.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.852248378Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/24f90fa3994b992d1a09003a3db2599330a5232a",
        "https://git.kernel.org/stable/c/54244d54a971c26a0cd0a9073460ff71f3c51b32",
        "https://git.kernel.org/stable/c/c25e0dec366ae99b7264324ce3c7cbaea34691f9",
        "https://git.kernel.org/stable/c/cb2bf5efdb02a2a59faf603604a1066e8266f349",
        "https://git.kernel.org/stable/c/d016c216bc75c45128160593a77b864a04dbe7c0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23412.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23412",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23412.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23412",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503429,
  "published_at": "2026-04-02T11:40:53.528+00:00"
}