CVE-2026-89456

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5e6bdd37c5526ef01326df5dabb93011ee89237e < 9e063165d3fe58db2a517717b830f17e82d03467affected
LinuxLinux5e6bdd37c5526ef01326df5dabb93011ee89237e < 6b0954c8a259da1e4aa745989f82723947acfb46affected
LinuxLinux5e6bdd37c5526ef01326df5dabb93011ee89237e < d0a2f97d8c97134aa7f6a191940b7bab4bb42f5faffected
LinuxLinux5e6bdd37c5526ef01326df5dabb93011ee89237e < f735b9710f0c8fe72c1060103e865f4ae678190baffected
LinuxLinux5e6bdd37c5526ef01326df5dabb93011ee89237e < d6b8778b1b82aa3a8dbf8612080f635b834bd16baffected
LinuxLinux5e6bdd37c5526ef01326df5dabb93011ee89237e < ceafb262475ac6cb3a7d07b1102608be2b216b99affected
LinuxLinux5e6bdd37c5526ef01326df5dabb93011ee89237e < 15ec03452c18e8d288e519837d21b308300d74b2affected
LinuxLinux5e6bdd37c5526ef01326df5dabb93011ee89237e < 6fb5ba2e7e43173a3761e46f091070a8185efa14affected
LinuxLinuxfbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04affected
LinuxLinux5f7c9989f11305aaa43e0f4378f4f070022a9f2baffected
LinuxLinux5.4.26 < 5.5affected
LinuxLinux5.5.10 < 5.6affected
LinuxLinux5.6affected
LinuxLinux0 < 5.6unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References