← Back to CVE Explorer

CVE-2026-89456

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Propagate partial completion length across ERP recovery dasd_default_erp_postaction() copies the timing and device state from the finished ERP request back to the original request but drops proc_bytes. A request that was partially completed, an ESE read of a not-yet-allocated track returns fewer bytes than requested, and then recovered through the ERP chain loses its partial-completion length. __dasd_cleanup_cqr() then sees proc_bytes == 0 and completes the whole request instead of requeueing the remainder, silently returning zeroed data for the part that was never read. Carry proc_bytes over to the original request like the other per-request state.

Severity
HIGH
CVSS score
7.0 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-11 20:19:26.387000
Last modified
2026-10-19 09:17:37.887000
View original CVE JSON 
{
  "id": "CVE-2026-89456",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-11T20:19:26.387",
  "lastModified": "2026-10-19T09:17:37.887",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/dasd: Propagate partial completion length across ERP recovery\n\ndasd_default_erp_postaction() copies the timing and device state from\nthe finished ERP request back to the original request but drops\nproc_bytes. A request that was partially completed, an ESE read of a\nnot-yet-allocated track returns fewer bytes than requested, and then\nrecovered through the ERP chain loses its partial-completion length.\n__dasd_cleanup_cqr() then sees proc_bytes == 0 and completes the whole\nrequest instead of requeueing the remainder, silently returning zeroed\ndata for the part that was never read.\n\nCarry proc_bytes over to the original request like the other\nper-request state."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/s390/block/dasd_erp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5e6bdd37c5526ef01326df5dabb93011ee89237e",
              "lessThan": "9e063165d3fe58db2a517717b830f17e82d03467",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5e6bdd37c5526ef01326df5dabb93011ee89237e",
              "lessThan": "6b0954c8a259da1e4aa745989f82723947acfb46",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5e6bdd37c5526ef01326df5dabb93011ee89237e",
              "lessThan": "d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5e6bdd37c5526ef01326df5dabb93011ee89237e",
              "lessThan": "f735b9710f0c8fe72c1060103e865f4ae678190b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5e6bdd37c5526ef01326df5dabb93011ee89237e",
              "lessThan": "d6b8778b1b82aa3a8dbf8612080f635b834bd16b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5e6bdd37c5526ef01326df5dabb93011ee89237e",
              "lessThan": "ceafb262475ac6cb3a7d07b1102608be2b216b99",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5e6bdd37c5526ef01326df5dabb93011ee89237e",
              "lessThan": "15ec03452c18e8d288e519837d21b308300d74b2",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5e6bdd37c5526ef01326df5dabb93011ee89237e",
              "lessThan": "6fb5ba2e7e43173a3761e46f091070a8185efa14",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5f7c9989f11305aaa43e0f4378f4f070022a9f2b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5.4.26",
              "lessThan": "5.5",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "5.5.10",
              "lessThan": "5.6",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/s390/block/dasd_erp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.6",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.6",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.270",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.221",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.109",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.50",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.4",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/15ec03452c18e8d288e519837d21b308300d74b2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6b0954c8a259da1e4aa745989f82723947acfb46",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6fb5ba2e7e43173a3761e46f091070a8185efa14",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9e063165d3fe58db2a517717b830f17e82d03467",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ceafb262475ac6cb3a7d07b1102608be2b216b99",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d6b8778b1b82aa3a8dbf8612080f635b834bd16b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f735b9710f0c8fe72c1060103e865f4ae678190b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}