CVE-2026-31590 (GCVE-0-2026-31590)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-06-14 17:42
VLAI
Title
KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION Drop the WARN in sev_pin_memory() on npages overflowing an int, as the WARN is comically trivially to trigger from userspace, e.g. by doing: struct kvm_enc_region range = { .addr = 0, .size = -1ul, }; __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range); Note, the checks in sev_mem_enc_register_region() that presumably exist to verify the incoming address+size are completely worthless, as both "addr" and "size" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater than ULONG_MAX. That wart will be cleaned up in the near future. if (range->addr > ULONG_MAX || range->size > ULONG_MAX) return -EINVAL; Opportunistically add a comment to explain why the code calculates the number of pages the "hard" way, e.g. instead of just shifting @ulen.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7180 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < 6a8e3c82122737529b25ef2a048fbcc569d8c055 (git)
Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < a703933bcfa5cc76ca10e2048464600e74136099 (git)
Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < abcd43ff579abd0a654bb4636086e78819dd5f4c (git)
Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < b670833749ffd8681361db2bb047c6f2e3075f3a (git)
Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < ab423e5892826202a660b5ac85d1125b0e8301a5 (git)
Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < 28cc13ca20431b127d42d84ba10898d03e2c8267 (git)
Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < c29ff288a2d97a6f4640a498a367cf0eb91312eb (git)
Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < 1cba4dcd795daf6d257122779fb6a349edf03914 (git)
Affected: 78824fabc72e5e37d51e6e567fde70a4fc41a6d7 , < 8acffeef5ef720c35e513e322ab08e32683f32f2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        "id": "CVE-2026-31590",
        "lastModified": "2026-06-17T10:34:02.540",
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                "attackComplexity": "LOW",
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                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
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                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-04-24T15:16:36.170",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1cba4dcd795daf6d257122779fb6a349edf03914"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/28cc13ca20431b127d42d84ba10898d03e2c8267"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6a8e3c82122737529b25ef2a048fbcc569d8c055"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8acffeef5ef720c35e513e322ab08e32683f32f2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a703933bcfa5cc76ca10e2048464600e74136099"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/ab423e5892826202a660b5ac85d1125b0e8301a5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/abcd43ff579abd0a654bb4636086e78819dd5f4c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b670833749ffd8681361db2bb047c6f2e3075f3a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c29ff288a2d97a6f4640a498a367cf0eb91312eb"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:55:31+00:00",
      "cve": "CVE-2026-31590",
      "id": "CVE-2026-31590",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31590.json",
      "version": "3"
    }
  }
}



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