CVE-2026-89458 (GCVE-0-2026-89458)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Do not complete a failed ESE read as successful dasd_int_handler() completes an NRF read of an unallocated ESE track by calling ese_read() and unconditionally marking the request DASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has zeroed the destination buffer: a failed sense-data parse or a current track outside the requested range both return early, leaving the destination pages untouched. The request is still completed successfully, so the block layer is handed stale / uninitialized memory instead of zeros. Check the ese_read() return value and fail the request through the normal error path instead of forcing DASD_CQR_SUCCESS.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5e6bdd37c5526ef01326df5dabb93011ee89237e
Version: 5e6bdd37c5526ef01326df5dabb93011ee89237e
Version: 5e6bdd37c5526ef01326df5dabb93011ee89237e
Version: 5e6bdd37c5526ef01326df5dabb93011ee89237e
Version: 5e6bdd37c5526ef01326df5dabb93011ee89237e
Version: 5e6bdd37c5526ef01326df5dabb93011ee89237e
Version: 5e6bdd37c5526ef01326df5dabb93011ee89237e
Version: 5e6bdd37c5526ef01326df5dabb93011ee89237e
Version: fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04
Version: 5f7c9989f11305aaa43e0f4378f4f070022a9f2b
Version: 5.4.26   ≤
Version: 5.5.10   ≤
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{
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          "programFiles": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Do not complete a failed ESE read as successful\n\ndasd_int_handler() completes an NRF read of an unallocated ESE track by\ncalling ese_read() and unconditionally marking the request\nDASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has\nzeroed the destination buffer: a failed sense-data parse or a current\ntrack outside the requested range both return early, leaving the\ndestination pages untouched. The request is still completed successfully,\nso the block layer is handed stale / uninitialized memory instead of\nzeros.\n\nCheck the ese_read() return value and fail the request through the normal\nerror path instead of forcing DASD_CQR_SUCCESS."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:47:07.708Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8cb96cffceead3cbd0541154d7ecc5e6474edda1"
        },
        {
          "url": "https://git.kernel.org/stable/c/77168af195d04b34c6de62b874624e74d64cef8d"
        },
        {
          "url": "https://git.kernel.org/stable/c/921ff697bb6f7067059793becf8b2d00de71ce41"
        },
        {
          "url": "https://git.kernel.org/stable/c/55f4df40178cdfede0d7ae848fbab00efa9b95c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9adf8399732306dfc97b3adb4778038743e3f5e"
        },
        {
          "url": "https://git.kernel.org/stable/c/52b331c99baac653ca794bd8487c8ec4de8db203"
        },
        {
          "url": "https://git.kernel.org/stable/c/b0d94dd6e82df396e2254c8b0f25eff7d19c2e7f"
        },
        {
          "url": "https://git.kernel.org/stable/c/cddb447c62466f3076938ce120028d7b591f9f37"
        }
      ],
      "title": "s390/dasd: Do not complete a failed ESE read as successful",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89458",
    "datePublished": "2026-09-11T19:43:21.346Z",
    "dateReserved": "2026-09-11T19:38:34.707Z",
    "dateUpdated": "2026-10-19T08:47:07.708Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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