CVE-2026-89924 (GCVE-0-2026-89924)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-10-19 08:54
VLAI
Title
KVM: s390: Fix old_data leak in guest debug error path
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix old_data leak in guest debug error path __import_wp_info() allocates a per-watchpoint old_data buffer to back up the original guest memory contents. If a later watchpoint of the same KVM_SET_GUEST_DEBUG request fails to import, kvm_s390_import_bp_data() jumps to the error label, which frees the wp_info array but not the old_data buffers of the entries that were imported successfully. Up to MAX_BP_COUNT - 1 buffers of up to MAX_WP_SIZE bytes are leaked per failed request, and the request can be repeated. Create error handling for cleaning up all created old_data memory areas.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < 124c81ee610e1fbdd93d4399f88d9e28ba97a941 (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4 (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < c85d402553987777cc4742751437ea5dcbf98a7b (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < 5fbf319137735252eefa507193c9a619af5b7457 (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < 4048d0a252163084794be3e37995b872c5178913 (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < f55e4d415d95342d5753e528e05a1e8623992c3f (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < 46cb8a273e2f853f89a78b59dbdff8787b6e1c86 (git)
Affected: 27291e2165b6de70c476b7b675308113edd69a60 , < aa9c8e8baf1e765fa65b93212522c636f25d846f (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kvm/guestdbg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "124c81ee610e1fbdd93d4399f88d9e28ba97a941",
              "status": "affected",
              "version": "27291e2165b6de70c476b7b675308113edd69a60",
              "versionType": "git"
            },
            {
              "lessThan": "e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4",
              "status": "affected",
              "version": "27291e2165b6de70c476b7b675308113edd69a60",
              "versionType": "git"
            },
            {
              "lessThan": "c85d402553987777cc4742751437ea5dcbf98a7b",
              "status": "affected",
              "version": "27291e2165b6de70c476b7b675308113edd69a60",
              "versionType": "git"
            },
            {
              "lessThan": "5fbf319137735252eefa507193c9a619af5b7457",
              "status": "affected",
              "version": "27291e2165b6de70c476b7b675308113edd69a60",
              "versionType": "git"
            },
            {
              "lessThan": "4048d0a252163084794be3e37995b872c5178913",
              "status": "affected",
              "version": "27291e2165b6de70c476b7b675308113edd69a60",
              "versionType": "git"
            },
            {
              "lessThan": "f55e4d415d95342d5753e528e05a1e8623992c3f",
              "status": "affected",
              "version": "27291e2165b6de70c476b7b675308113edd69a60",
              "versionType": "git"
            },
            {
              "lessThan": "46cb8a273e2f853f89a78b59dbdff8787b6e1c86",
              "status": "affected",
              "version": "27291e2165b6de70c476b7b675308113edd69a60",
              "versionType": "git"
            },
            {
              "lessThan": "aa9c8e8baf1e765fa65b93212522c636f25d846f",
              "status": "affected",
              "version": "27291e2165b6de70c476b7b675308113edd69a60",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kvm/guestdbg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.16"
            },
            {
              "lessThan": "3.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "3.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix old_data leak in guest debug error path\n\n__import_wp_info() allocates a per-watchpoint old_data buffer to back up\nthe original guest memory contents. If a later watchpoint of the same\nKVM_SET_GUEST_DEBUG request fails to import, kvm_s390_import_bp_data()\njumps to the error label, which frees the wp_info array but not the\nold_data buffers of the entries that were imported successfully. Up to\nMAX_BP_COUNT - 1 buffers of up to MAX_WP_SIZE bytes are leaked per failed\nrequest, and the request can be repeated.\n\nCreate error handling for cleaning up all created old_data memory\nareas."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:54:59.186Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/124c81ee610e1fbdd93d4399f88d9e28ba97a941"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/c85d402553987777cc4742751437ea5dcbf98a7b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5fbf319137735252eefa507193c9a619af5b7457"
        },
        {
          "url": "https://git.kernel.org/stable/c/4048d0a252163084794be3e37995b872c5178913"
        },
        {
          "url": "https://git.kernel.org/stable/c/f55e4d415d95342d5753e528e05a1e8623992c3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/46cb8a273e2f853f89a78b59dbdff8787b6e1c86"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa9c8e8baf1e765fa65b93212522c636f25d846f"
        }
      ],
      "title": "KVM: s390: Fix old_data leak in guest debug error path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89924",
    "datePublished": "2026-09-16T10:32:17.442Z",
    "dateReserved": "2026-09-11T19:38:34.775Z",
    "dateUpdated": "2026-10-19T08:54:59.186Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89924",
      "date": "2026-10-24",
      "epss": "0.00211",
      "percentile": "0.1078"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:39:01.000Z",
      "cve": "CVE-2026-89924",
      "id": "msrc_CVE-2026-89924",
      "initial_release_date": "2026-09-17T01:08:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "KVM: s390: Fix old_data leak in guest debug error path",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89924.json",
      "version": "6"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "arch/s390/kvm/guestdbg.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "124c81ee610e1fbdd93d4399f88d9e28ba97a941",
                    "status": "affected",
                    "version": "27291e2165b6de70c476b7b675308113edd69a60",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4",
                    "status": "affected",
                    "version": "27291e2165b6de70c476b7b675308113edd69a60",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "c85d402553987777cc4742751437ea5dcbf98a7b",
                    "status": "affected",
                    "version": "27291e2165b6de70c476b7b675308113edd69a60",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5fbf319137735252eefa507193c9a619af5b7457",
                    "status": "affected",
                    "version": "27291e2165b6de70c476b7b675308113edd69a60",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "4048d0a252163084794be3e37995b872c5178913",
                    "status": "affected",
                    "version": "27291e2165b6de70c476b7b675308113edd69a60",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "f55e4d415d95342d5753e528e05a1e8623992c3f",
                    "status": "affected",
                    "version": "27291e2165b6de70c476b7b675308113edd69a60",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "46cb8a273e2f853f89a78b59dbdff8787b6e1c86",
                    "status": "affected",
                    "version": "27291e2165b6de70c476b7b675308113edd69a60",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "aa9c8e8baf1e765fa65b93212522c636f25d846f",
                    "status": "affected",
                    "version": "27291e2165b6de70c476b7b675308113edd69a60",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "arch/s390/kvm/guestdbg.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "3.16"
                  },
                  {
                    "lessThan": "3.16",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.270",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.221",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.188",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.157",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.110",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.51",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.5",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix old_data leak in guest debug error path\n\n__import_wp_info() allocates a per-watchpoint old_data buffer to back up\nthe original guest memory contents. If a later watchpoint of the same\nKVM_SET_GUEST_DEBUG request fails to import, kvm_s390_import_bp_data()\njumps to the error label, which frees the wp_info array but not the\nold_data buffers of the entries that were imported successfully. Up to\nMAX_BP_COUNT - 1 buffers of up to MAX_WP_SIZE bytes are leaked per failed\nrequest, and the request can be repeated.\n\nCreate error handling for cleaning up all created old_data memory\nareas."
          }
        ],
        "id": "CVE-2026-89924",
        "lastModified": "2026-10-19T09:18:37.927",
        "metrics": {},
        "published": "2026-09-16T11:17:01.527",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/124c81ee610e1fbdd93d4399f88d9e28ba97a941"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4048d0a252163084794be3e37995b872c5178913"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/46cb8a273e2f853f89a78b59dbdff8787b6e1c86"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5fbf319137735252eefa507193c9a619af5b7457"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/aa9c8e8baf1e765fa65b93212522c636f25d846f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c85d402553987777cc4742751437ea5dcbf98a7b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f55e4d415d95342d5753e528e05a1e8623992c3f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-10-05T20:02:25+00:00",
      "cve": "CVE-2026-89924",
      "id": "CVE-2026-89924",
      "initial_release_date": "2026-09-16T00:00:00+00:00",
      "product_status:known_affected": "235",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: s390: Fix old_data leak in guest debug error path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89924.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T00:54:49Z",
      "cve": "CVE-2026-89924",
      "id": "CVE-2026-89924",
      "initial_release_date": "2026-09-17T16:34:38Z",
      "product_status:known_affected": "344",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89924",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89924.json",
      "version": "5"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.