CVE-2026-89456
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.
How to fix
- Linux Linux9e063165d3fe58db2a517717b830f17e82d03467, 6b0954c8a259da1e4aa745989f82723947acfb46, d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f, f735b9710f0c8fe72c1060103e865f4ae678190b, d6b8778b1b82aa3a8dbf8612080f635b834bd16b, ceafb262475ac6cb3a7d07b1102608be2b216b99, 15ec03452c18e8d288e519837d21b308300d74b2, 6fb5ba2e7e43173a3761e46f091070a8185efa14, 5.5, 5.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 5e6bdd37c5526ef01326df5dabb93011ee89237e ≤ v < 9e063165d3fe58db2a517717b830f17e82d03467, 5e6bdd37c5526ef01326df5dabb93011ee89237e ≤ v < 6b0954c8a259da1e4aa745989f82723947acfb46, 5e6bdd37c5526ef01326df5dabb93011ee89237e ≤ v < d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f, 5e6bdd37c5526ef01326df5dabb93011ee89237e ≤ v < f735b9710f0c8fe72c1060103e865f4ae678190b, 5e6bdd37c5526ef01326df5dabb93011ee89237e ≤ v < d6b8778b1b82aa3a8dbf8612080f635b834bd16b, 5e6bdd37c5526ef01326df5dabb93011ee89237e ≤ v < ceafb262475ac6cb3a7d07b1102608be2b216b99, 5e6bdd37c5526ef01326df5dabb93011ee89237e ≤ v < 15ec03452c18e8d288e519837d21b308300d74b2, 5e6bdd37c5526ef01326df5dabb93011ee89237e ≤ v < 6fb5ba2e7e43173a3761e46f091070a8185efa14, fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04, 5f7c9989f11305aaa43e0f4378f4f070022a9f2b, 5.4.26 ≤ v < 5.5, 5.5.10 ≤ v < 5.6, 5.6 | 9e063165d3fe58db2a517717b830f17e82d03467, 6b0954c8a259da1e4aa745989f82723947acfb46, d0a2f97d8c97134aa7f6a191940b7bab4bb42f5f, f735b9710f0c8fe72c1060103e865f4ae678190b, d6b8778b1b82aa3a8dbf8612080f635b834bd16b, ceafb262475ac6cb3a7d07b1102608be2b216b99, 15ec03452c18e8d288e519837d21b308300d74b2, 6fb5ba2e7e43173a3761e46f091070a8185efa14, 5.5, 5.6 |
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