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KVM: s390: Fix old_data leak in guest debug error path

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-89924

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89924

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "124c81ee610e1fbdd93d4399f88d9e28ba97a941",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "e5ae7816e5ad145618f7fd568a0e8a94dd9f81f4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "c85d402553987777cc4742751437ea5dcbf98a7b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "5fbf319137735252eefa507193c9a619af5b7457",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "4048d0a252163084794be3e37995b872c5178913",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "f55e4d415d95342d5753e528e05a1e8623992c3f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "46cb8a273e2f853f89a78b59dbdff8787b6e1c86",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "27291e2165b6de70c476b7b675308113edd69a60",
        "lessThan": "aa9c8e8baf1e765fa65b93212522c636f25d846f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/s390/kvm/guestdbg.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/s390/kvm/guestdbg.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89924

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#36368 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-89924 · Revision 1Source updated