FKIE_CVE-2026-89924

Vulnerability from fkie_nvd - Published: 2026-09-16 11:17 - Updated: 2026-09-16 11:17
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/124c81ee610e1fbdd93d4399f88d9e28ba97a941
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4048d0a252163084794be3e37995b872c5178913
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/46cb8a273e2f853f89a78b59dbdff8787b6e1c86
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5fbf319137735252eefa507193c9a619af5b7457
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aa9c8e8baf1e765fa65b93212522c636f25d846f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c85d402553987777cc4742751437ea5dcbf98a7b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f55e4d415d95342d5753e528e05a1e8623992c3f
Impacted products
Vendor Product Version
To clipboard 

{
  "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-rc1",
              "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": "2026-09-16T11:17:01.527",
  "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"
}



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