{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1b12171533a9bb23cf6fba7262b479028b65e1e8"
            },
            {
              "fixed": "092c2874dc1b2060fa77a465a971acd4fdf87683"
            },
            {
              "fixed": "135d542b97fa93e32c457d49d6e7b33ca7d05bae"
            },
            {
              "fixed": "6b1f786ad85a0b63393b76f5e634deab1a73198c"
            },
            {
              "fixed": "7441ee8276641bddaf1cba7bb75ef9c1458ceb3b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "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-2026-98037.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject untrusted allocated-object pointers\n\nWhen the final RCU read-side critical section ends, a local kptr is demoted\nto PTR_UNTRUSTED but retains MEM_ALLOC. The pointer may be NULL or may refer\nto an object whose lifetime is no longer protected.\n\ntype_is_ptr_alloc_obj() nevertheless recognizes any PTR_TO_BTF_ID with\nMEM_ALLOC as a live allocated object. In particular, a refcount-only local\nkptr never carries NON_OWN_REF, so it still passes the\nbpf_refcount_acquire() argument check after RCU protection ends. The kfunc\ncan then dereference NULL or stale memory.\n\nMake type_is_ptr_alloc_obj() reject PTR_UNTRUSTED pointers. Since\ntype_is_non_owning_ref() is based on the same predicate, graph kfunc\narguments obey the same live-object requirement. Fault-protected reads of\nthe demoted pointer remain valid: writes are already rejected, and read\nfixups use bpf_may_fault_on_deref() rather than this predicate.\n\n[ kkd: Rewrote commit log ]",
  "id": "CVE-2026-98037",
  "modified": "2026-09-27T03:30:20.325931079Z",
  "published": "2026-09-25T10:23:51.126Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/092c2874dc1b2060fa77a465a971acd4fdf87683"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/135d542b97fa93e32c457d49d6e7b33ca7d05bae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b1f786ad85a0b63393b76f5e634deab1a73198c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7441ee8276641bddaf1cba7bb75ef9c1458ceb3b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98037.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98037"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "bpf: Reject untrusted allocated-object pointers"
}