CVE-2026-89456

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.

CVSS 3.1

7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.1% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-25)

Published

2026-09-11

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

References

• https://git.kernel.org/stable/c/15ec03452c18e8d288e519837d21b308300d74b2
• https://git.kernel.org/stable/c/6b0954c8a259da1e4aa745989f82723947acfb46
• https://git.kernel.org/stable/c/6fb5ba2e7e43173a3761e46f091070a8185efa14
• https://git.kernel.org/stable/c/9e063165d3fe58db2a517717b830f17e82d03467
• https://git.kernel.org/stable/c/ceafb262475ac6cb3a7d07b1102608be2b216b99

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