{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "bc8023ef3b11410682e5d4990e05e5bc2d3e1c94"
            },
            {
              "fixed": "525e408c27ae714e538b8c608c3a974df3ab6c92"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
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              "introduced": "555c0b713ca83968d3c843cb15485b9ba3367b1b"
            },
            {
              "fixed": "41b4320b84fdafe1ab586b06453d30d50415db59"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "4b82b181a26cff8bf7adc3a85a88d121d92edeaf"
            },
            {
              "fixed": "9697db03e010391c55ae75192cbdf30c5a72c114"
            },
            {
              "fixed": "b584f107ab90222bd825dcb4c5977326ff684109"
            },
            {
              "fixed": "f08aaee3152d0dfc578b3f2586932d82062701dd"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "4707ad649cf662add3058bff47430817811b048d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.93"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.12.31"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.14.9"
            },
            {
              "fixed": "6.15"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.15.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72427.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix effective prog array index with BPF_F_PREORDER\n\nreplace_effective_prog() and purge_effective_progs() located the slot in\nthe effective array by walking the program hlist and counting entries\nlinearly. That count does not match the array layout: compute_effective_\nprogs() places BPF_F_PREORDER programs at the front (ancestor cgroup\nfirst, attach order within a cgroup) and the rest after them (descendant\ncgroup first). So when a preorder program is present, the linear hlist\nposition no longer equals the program's index in the effective array.\n\nFor replace_effective_prog() (bpf_link_update()) this overwrote the\nwrong slot, corrupting the effective order. For purge_effective_progs(),\nit could dummy out a slot belonging to a different program and leave the\ndetached program in the array while bpf_prog_put() drops its reference,\ni.e. a use-after-free.\n\nFix both by replaying compute_effective_progs()'s placement (including\nthe per-cgroup preorder reversal) in a shared effective_prog_pos()\nhelper. Identify the entry by its struct bpf_prog_list pointer rather\nthan by (prog, link) value, so the lookup resolves to exactly the\nattachment the syscall selected even when the same bpf_prog is attached\nto several cgroups in the hierarchy.",
  "id": "CVE-2026-72427",
  "modified": "2026-08-16T03:31:04.576406468Z",
  "published": "2026-08-15T05:56:44.197Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41b4320b84fdafe1ab586b06453d30d50415db59"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/525e408c27ae714e538b8c608c3a974df3ab6c92"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9697db03e010391c55ae75192cbdf30c5a72c114"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b584f107ab90222bd825dcb4c5977326ff684109"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f08aaee3152d0dfc578b3f2586932d82062701dd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72427.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72427"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "bpf: Fix effective prog array index with BPF_F_PREORDER"
}