{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "36d8bdf75a93190e5669b9d1d95994e13e15ba1d"
            },
            {
              "fixed": "aaa9cf7707d1c5c0d2ca9d40c8b71652ac1c3c3f"
            },
            {
              "fixed": "0bdd6121c8dd5f1764efe701ce26bb8e15acb172"
            },
            {
              "fixed": "ad4ebae5dbc2d47b544aa54f03c12490065be08a"
            },
            {
              "fixed": "048029ba1c793f8cabc4ad5eea765da01903f8f1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.111"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98039.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Require MEM_PERCPU for percpu kptr stores\n\nmap_kptr_match_type() treats perm_flags as the set of register type flags\nthat a kptr field permits. Adding MEM_PERCPU to that set for\nBPF_KPTR_PERCPU does not require the source register to carry it, however.\nThe subset test consequently accepts both a plain bpf_obj_new() allocation\nand a referenced kernel pointer into a __percpu_kptr map field.\n\nLoads from the field are always marked MEM_PERCPU. Consumers then treat the\nstored value as the cookie returned by bpf_percpu_obj_new(): per-CPU pointer\nhelpers relocate it, and map teardown selects the per-CPU free path. A plain\nallocation can therefore provide an arbitrary kernel read/write, while a\nkernel pointer can be relocated into an invalid address or sent through a\nmissing destructor.\n\nRequire the source MEM_PERCPU flag to match the destination field kind.\nThis preserves valid bpf_percpu_obj_new() stores and rejects both the\nprogram-BTF and kernel-BTF variants.",
  "id": "CVE-2026-98039",
  "modified": "2026-09-27T03:30:52.819394554Z",
  "published": "2026-09-25T10:23:52.360Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/048029ba1c793f8cabc4ad5eea765da01903f8f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0bdd6121c8dd5f1764efe701ce26bb8e15acb172"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aaa9cf7707d1c5c0d2ca9d40c8b71652ac1c3c3f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad4ebae5dbc2d47b544aa54f03c12490065be08a"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98039.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98039"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "bpf: Require MEM_PERCPU for percpu kptr stores"
}