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

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 10:32
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
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)
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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-rc1 , ≤ * (original_commit_for_fix)
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          "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."
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    "dateReserved": "2026-09-11T19:38:34.775Z",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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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.

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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.
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  • 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.



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