{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "baefdbdf6812e120c9fba9cfb101d3656f478026"
            },
            {
              "fixed": "3a0f73d27a8d379a8852a378b3c3208143e3b3b2"
            },
            {
              "fixed": "7c58ace08f180f8e249e714d1623388362f9d807"
            },
            {
              "fixed": "9a3c3c49c333760c8944dadacbe114c1884546ef"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.18.0"
            },
            {
              "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/2026/74xxx/CVE-2026-74364.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject exclusive maps as inner maps in map-in-map\n\nAn exclusive map (created with excl_prog_hash) is bound to a single\nprogram by hash: check_map_prog_compatibility() refuses to load any\nprogram whose digest does not match map-\u003eexcl_prog_sha. That check\nonly runs for maps a program references directly, i.e. its used_maps.\nA map reached at runtime through a map-of-maps is never in used_maps,\nand bpf_map_meta_equal() does not consider excl_prog_sha, so an\nexclusive map can be inserted into a non-exclusive outer map and\nthen looked up and mutated by an unrelated program, bypassing the\nexclusivity guarantee.\n\nFor the signed loader this defeats the metadata map exclusivity check\nadded in the signed loader: the cached map-\u003esha[] is validated against\nthe signed hash while another program on a hostile host rewrites the\nfrozen map's contents through the outer map.",
  "id": "CVE-2026-74364",
  "modified": "2026-08-18T03:31:24.663463668Z",
  "published": "2026-08-15T05:58:46.926Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3a0f73d27a8d379a8852a378b3c3208143e3b3b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c58ace08f180f8e249e714d1623388362f9d807"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a3c3c49c333760c8944dadacbe114c1884546ef"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74364.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74364"
    },
    {
      "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "bpf: Reject exclusive maps as inner maps in map-in-map"
}