CVE-2026-89456
HighCVSS 7.0Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In the Linux kernel, the s390/dasd driver's dasd_default_erp_postaction() copies timing and device state from the finished ERP request back to the original request but drops proc_bytes. A partially completed request (an ESE read of a not-yet-allocated track returns fewer bytes than requested) that is then recovered through the ERP chain loses its partial-completion length, so __dasd_cleanup_cqr() 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.
Risk Assessment
Applications may receive zeroed data in place of a portion that was never read, leading to silent data loss or corruption.
Recommendation
Update the Linux kernel to a version with the fix that carries proc_bytes over to the original request like the other per-request state.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS