CVE-2025-39815 (GCVE-0-2025-39815)
Vulnerability from cvelistv5
Published
2025-09-16 13:00
Modified
2025-09-16 13:00
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: fix stack overrun when loading vlenb The userspace load can put up to 2048 bits into an xlen bit stack buffer. We want only xlen bits, so check the size beforehand.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d28659b692a0212f360f8bd8a58712b339f9aac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/799766208f09f95677a9ab111b93872d414fbad7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c76bf8359188a11f8fd790e5bbd6077894a245cc
Impacted products
Vendor Product Version
Linux Linux Version: 2fa290372dfe7dd248b1c16f943f273a3e674f22
Version: 2fa290372dfe7dd248b1c16f943f273a3e674f22
Version: 2fa290372dfe7dd248b1c16f943f273a3e674f22
 Create a notification for this product.
   Linux Linux Version: 6.8
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/kvm/vcpu_vector.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c76bf8359188a11f8fd790e5bbd6077894a245cc",
              "status": "affected",
              "version": "2fa290372dfe7dd248b1c16f943f273a3e674f22",
              "versionType": "git"
            },
            {
              "lessThan": "6d28659b692a0212f360f8bd8a58712b339f9aac",
              "status": "affected",
              "version": "2fa290372dfe7dd248b1c16f943f273a3e674f22",
              "versionType": "git"
            },
            {
              "lessThan": "799766208f09f95677a9ab111b93872d414fbad7",
              "status": "affected",
              "version": "2fa290372dfe7dd248b1c16f943f273a3e674f22",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/kvm/vcpu_vector.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.45",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.5",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17-rc4",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: fix stack overrun when loading vlenb\n\nThe userspace load can put up to 2048 bits into an xlen bit stack\nbuffer.  We want only xlen bits, so check the size beforehand."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-16T13:00:16.250Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c76bf8359188a11f8fd790e5bbd6077894a245cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d28659b692a0212f360f8bd8a58712b339f9aac"
        },
        {
          "url": "https://git.kernel.org/stable/c/799766208f09f95677a9ab111b93872d414fbad7"
        }
      ],
      "title": "RISC-V: KVM: fix stack overrun when loading vlenb",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39815",
    "datePublished": "2025-09-16T13:00:16.250Z",
    "dateReserved": "2025-04-16T07:20:57.138Z",
    "dateUpdated": "2025-09-16T13:00:16.250Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39815\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T13:15:56.240\",\"lastModified\":\"2025-09-18T13:43:34.310\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRISC-V: KVM: fix stack overrun when loading vlenb\\n\\nThe userspace load can put up to 2048 bits into an xlen bit stack\\nbuffer.  We want only xlen bits, so check the size beforehand.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6d28659b692a0212f360f8bd8a58712b339f9aac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/799766208f09f95677a9ab111b93872d414fbad7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c76bf8359188a11f8fd790e5bbd6077894a245cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.