{"id":"CVE-2026-89456","title":"s390/dasd: Propagate partial completion length across ERP recovery","summary":"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 …","severity":"high","cvss":7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-908"],"vendor":"Linux","product":"Linux","affected":["Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 9e063165d3fe58db2a517717b830f17e82d03467","Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 6b0954c8a259da1e4aa745989f82723947acfb46","Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f","Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < f735b9710f0c8fe72c1060103e865f4ae678190b","Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < d6b8778b1b82aa3a8dbf8612080f635b834bd16b","Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < ceafb262475ac6cb3a7d07b1102608be2b216b99","Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 15ec03452c18e8d288e519837d21b308300d74b2","Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 6fb5ba2e7e43173a3761e46f091070a8185efa14","Linux fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04","Linux 5f7c9989f11305aaa43e0f4378f4f070022a9f2b","Linux >= 5.4.26 < 5.5","Linux >= 5.5.10 < 5.6","Linux 5.6"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:47:05.735Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89456","references":[{"url":"https://git.kernel.org/stable/c/9e063165d3fe58db2a517717b830f17e82d03467"},{"url":"https://git.kernel.org/stable/c/6b0954c8a259da1e4aa745989f82723947acfb46"},{"url":"https://git.kernel.org/stable/c/d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f"},{"url":"https://git.kernel.org/stable/c/f735b9710f0c8fe72c1060103e865f4ae678190b"},{"url":"https://git.kernel.org/stable/c/d6b8778b1b82aa3a8dbf8612080f635b834bd16b"},{"url":"https://git.kernel.org/stable/c/ceafb262475ac6cb3a7d07b1102608be2b216b99"},{"url":"https://git.kernel.org/stable/c/15ec03452c18e8d288e519837d21b308300d74b2"},{"url":"https://git.kernel.org/stable/c/6fb5ba2e7e43173a3761e46f091070a8185efa14"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89456.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89456"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532243"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89456"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89456"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89456.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00149,"epssPercentile":0.04061,"ingestedAt":"2026-09-14T15:23:07.453Z","slug":"CVE-2026-89456","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 9e063165d3fe58db2a517717b830f17e82d03467`\n- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 6b0954c8a259da1e4aa745989f82723947acfb46`\n- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f`\n- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < f735b9710f0c8fe72c1060103e865f4ae678190b`\n- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < d6b8778b1b82aa3a8dbf8612080f635b834bd16b`\n- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < ceafb262475ac6cb3a7d07b1102608be2b216b99`\n- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 15ec03452c18e8d288e519837d21b308300d74b2`\n- `Linux >= 5e6bdd37c5526ef01326df5dabb93011ee89237e < 6fb5ba2e7e43173a3761e46f091070a8185efa14`\n- `Linux fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04`\n- `Linux 5f7c9989f11305aaa43e0f4378f4f070022a9f2b`\n- `Linux >= 5.4.26 < 5.5`\n- `Linux >= 5.5.10 < 5.6`\n- `Linux 5.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89456.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":38.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":198048,"id":"CVE-2026-89456","ts":1789384321540,"field":"cvss","old":"5.2","new":"7"},{"seq":198047,"id":"CVE-2026-89456","ts":1789384321540,"field":"severity","old":"medium","new":"high"},{"seq":183540,"id":"CVE-2026-89456","ts":1789356675805,"field":"cvss","old":"7","new":"5.2"},{"seq":183539,"id":"CVE-2026-89456","ts":1789356675805,"field":"severity","old":"high","new":"medium"},{"seq":153236,"id":"CVE-2026-89456","ts":1789285349672,"field":"cvss","old":null,"new":"7"},{"seq":153235,"id":"CVE-2026-89456","ts":1789285349672,"field":"severity","old":"none","new":"high"},{"seq":147504,"id":"CVE-2026-89456","ts":1789270211168,"field":"cvss","old":null,"new":"5.2"},{"seq":147503,"id":"CVE-2026-89456","ts":1789270211168,"field":"severity","old":"none","new":"medium"},{"seq":109264,"id":"CVE-2026-89456","ts":1789183731197,"field":"cvss","old":null,"new":"5.2"},{"seq":109263,"id":"CVE-2026-89456","ts":1789183731197,"field":"severity","old":"none","new":"medium"}]}