CVE-2026-89456 in Linux
Resumen
por MITRE • 2026-09-12
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.
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