{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "78824fabc72e5e37d51e6e567fde70a4fc41a6d7"
            },
            {
              "fixed": "6a8e3c82122737529b25ef2a048fbcc569d8c055"
            },
            {
              "fixed": "a703933bcfa5cc76ca10e2048464600e74136099"
            },
            {
              "fixed": "abcd43ff579abd0a654bb4636086e78819dd5f4c"
            },
            {
              "fixed": "b670833749ffd8681361db2bb047c6f2e3075f3a"
            },
            {
              "fixed": "ab423e5892826202a660b5ac85d1125b0e8301a5"
            },
            {
              "fixed": "28cc13ca20431b127d42d84ba10898d03e2c8267"
            },
            {
              "fixed": "c29ff288a2d97a6f4640a498a367cf0eb91312eb"
            },
            {
              "fixed": "1cba4dcd795daf6d257122779fb6a349edf03914"
            },
            {
              "fixed": "8acffeef5ef720c35e513e322ab08e32683f32f2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.9.0"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.136"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.83"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.24"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.14"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.20.0"
            },
            {
              "fixed": "7.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31590.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION\n\nDrop the WARN in sev_pin_memory() on npages overflowing an int, as the\nWARN is comically trivially to trigger from userspace, e.g. by doing:\n\n  struct kvm_enc_region range = {\n          .addr = 0,\n          .size = -1ul,\n  };\n\n  __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, \u0026range);\n\nNote, the checks in sev_mem_enc_register_region() that presumably exist to\nverify the incoming address+size are completely worthless, as both \"addr\"\nand \"size\" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater\nthan ULONG_MAX.  That wart will be cleaned up in the near future.\n\n\tif (range-\u003eaddr \u003e ULONG_MAX || range-\u003esize \u003e ULONG_MAX)\n\t\treturn -EINVAL;\n\nOpportunistically add a comment to explain why the code calculates the\nnumber of pages the \"hard\" way, e.g. instead of just shifting @ulen.",
  "id": "CVE-2026-31590",
  "modified": "2026-08-12T03:51:31.711932673Z",
  "published": "2026-04-24T14:42:17.629Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1cba4dcd795daf6d257122779fb6a349edf03914"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/28cc13ca20431b127d42d84ba10898d03e2c8267"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a8e3c82122737529b25ef2a048fbcc569d8c055"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8acffeef5ef720c35e513e322ab08e32683f32f2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a703933bcfa5cc76ca10e2048464600e74136099"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab423e5892826202a660b5ac85d1125b0e8301a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/abcd43ff579abd0a654bb4636086e78819dd5f4c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b670833749ffd8681361db2bb047c6f2e3075f3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c29ff288a2d97a6f4640a498a367cf0eb91312eb"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31590.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31590"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION"
}