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        "ecosystem": "Linux",
        "name": "Kernel"
      },
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            }
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  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74305.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Tighten cgroup storage cookie checks for prog arrays\n\nThe fix in commit abad3d0bad72 (\"bpf: Fix oob access in cgroup local\nstorage\") is still incomplete. The prog-array compatibility check\ntreats a program with no cgroup storage as compatible with any stored\nstorage cookie. This allows a storage-less program to bridge a tail\ncall chain between an entry program and a storage-using callee even\nthough cgroup local storage at runtime still follows the caller's\ncontext, that is, A -\u003e B(no storage) -\u003e C(storage) path.\n\nRequiring exact cookie equality would break the legitimate case of a\nstorage-less leaf program being tail called from a storage-using one.\nInstead, only accept a zero storage cookie if the program cannot\nperform tail calls itself. This keeps A -\u003e B(no storage) working\nwhile rejecting the A -\u003e B(no storage) -\u003e C(storage) bridge.",
  "id": "CVE-2026-74305",
  "modified": "2026-08-18T03:31:07.926508399Z",
  "published": "2026-08-15T05:58:06.654Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10627ddc0167aab5c1c390a10ef461e9937aba08"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c762d28698483ce7c372091f34d86e4d4828652"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46fbafe3d2d569d828e8d24a7dbe1659f63685cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87177497cca90bf4fcfb759eb898560eb5b46a10"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ca06849c4239aa2d580c54651f8588c51cb398b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb22dc79528eb26a46d346c3118dbd6b14c70609"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb73056ce2a6f101ddd3bdba89af6b24ebffff85"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74305.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74305"
    },
    {
      "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: Tighten cgroup storage cookie checks for prog arrays"
}