{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8580ac9404f6240668a026785d7d8856f0530409"
            },
            {
              "fixed": "f32a4a40bc635be25d6816da4bd91e9e58c31bf3"
            },
            {
              "fixed": "a7fe72d780122eb934536f1719abad445f6afdf7"
            },
            {
              "fixed": "e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053"
            },
            {
              "fixed": "978524ecfc1c539282df5858de1eec20748c6f74"
            },
            {
              "fixed": "eaf302628a78806f66d8224d6ba03fb4d5025de4"
            },
            {
              "fixed": "2892f3f44bf865c8fb6b6c0960edec4cc91806ee"
            },
            {
              "fixed": "86d11c594d60b255b526fa5260f669463fb1a063"
            },
            {
              "fixed": "92863e678070f57c17c868e4bfa2441a5c61ad2b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.5.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "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-2026-93138.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux\n\nbpf_get_btf_vmlinux() lazily parses the vmlinux BTF under the\nbpf_verifier_lock, but publishes the result through a plain store\nand re-checks it through a plain lockless load. Nothing orders\nthe stores initializing the struct btf inside btf_parse_vmlinux()\nagainst the store publishing the pointer: On a weakly ordered\narch, a concurrent first-time caller taking the lockless fast\npath could in principle observe the pointer before the parsed\ncontents are visible. The mutex_unlock() does not help such a\nreader given it only synchronizes with a later acquisition of the\nsame lock. Thus, publish the pointer with smp_store_release()\nand read it on the fast path with smp_load_acquire().\n\nAcquire semantics are needed rather than a dependency-ordered\nREAD_ONCE(): btf_parse_vmlinux() also populates globals outside\nthe returned object (e.g. bpf_ctx_convert.t). An address\ndependency would only order accesses performed through the\npointer and not cover other globals.",
  "id": "CVE-2026-93138",
  "modified": "2026-09-19T03:30:16.279344197Z",
  "published": "2026-09-17T16:11:38.795Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2892f3f44bf865c8fb6b6c0960edec4cc91806ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86d11c594d60b255b526fa5260f669463fb1a063"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/92863e678070f57c17c868e4bfa2441a5c61ad2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/978524ecfc1c539282df5858de1eec20748c6f74"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7fe72d780122eb934536f1719abad445f6afdf7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e18a10b39c994f04e1ebd7f8fc042bb1ca8ad053"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eaf302628a78806f66d8224d6ba03fb4d5025de4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f32a4a40bc635be25d6816da4bd91e9e58c31bf3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93138.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93138"
    },
    {
      "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: Fix vmlinux BTF prep race in bpf_get_btf_vmlinux"
}