{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "317460317a02a1af512697e6e964298dedd8a163"
            },
            {
              "fixed": "90453eaf8f14e7be0ab03983f2a93aeb6b990a58"
            },
            {
              "fixed": "a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20"
            },
            {
              "fixed": "8a08635656037aee9c12231ed384449c4ffb1a93"
            },
            {
              "fixed": "b5a71cb2db6d84ac0042549dcec266b18429d41e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.9.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93045.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject arena frees below the arena base\n\nbpf_arena_free_pages() accepts scalar arena addresses. The runtime\nmasks the address to the low 32 bits and reconstructs a full user\naddress from the arena base before returning the range to the arena\nfree tree.\n\nWhen the scalar value is below the low 32 bits of the arena base,\nfull_uaddr falls below user_vm_start. The existing upper-end clipping\nthen turns this into an out-of-range free-tree offset. A later\nallocation can reuse that offset and return an address below the arena\nmapping.\n\nReject such frees before computing the clipped range.",
  "id": "CVE-2026-93045",
  "modified": "2026-09-20T11:30:53.127057951Z",
  "published": "2026-09-17T16:10:36.988Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a08635656037aee9c12231ed384449c4ffb1a93"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/90453eaf8f14e7be0ab03983f2a93aeb6b990a58"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5a71cb2db6d84ac0042549dcec266b18429d41e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93045.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93045"
    },
    {
      "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:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "bpf: Reject arena frees below the arena base"
}