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CVE-2026-89458

UnknownEPSS 0.17%

Last modified

CVE-2026-89458 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Do not complete a failed ESE read as successful dasd_int_handler() completes an NRF read of an unallocated ESE track by calling ese_read() and unconditionally marking the request DASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has zeroed the destination buffer: a failed sense-data parse or a current track outside the requested range both return early, leaving the destination pages untouched. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Do not complete a failed ESE read as successful dasd_int_handler() completes an NRF read of an unallocated ESE track by calling ese_read() and unconditionally marking the request DASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has zeroed the destination buffer: a failed sense-data parse or a current track outside the requested range both return early, leaving the destination pages untouched. The request is still completed successfully, so the block layer is handed stale / uninitialized memory instead of zeros. Check the ese_read() return value and fail the request through the normal error path instead of forcing DASD_CQR_SUCCESS.

Metrics

EPSS Probability
0.17%

6.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 5e6bdd37c5526ef01326df5dabb93011ee89237e, < 8cb96cffceead3cbd0541154d7ecc5e6474edda1; >= 5e6bdd37c5526ef01326df5dabb93011ee89237e, < 77168af195d04b34c6de62b874624e74d64cef8d; >= 5e6bdd37c5526ef01326df5dabb93011ee89237e, < 921ff697bb6f7067059793becf8b2d00de71ce41; >= 5e6bdd37c5526ef01326df5dabb93011ee89237e, < 55f4df40178cdfede0d7ae848fbab00efa9b95c1; >= 5e6bdd37c5526ef01326df5dabb93011ee89237e, < c9adf8399732306dfc97b3adb4778038743e3f5e; >= 5e6bdd37c5526ef01326df5dabb93011ee89237e, < 52b331c99baac653ca794bd8487c8ec4de8db203; >= 5e6bdd37c5526ef01326df5dabb93011ee89237e, < b0d94dd6e82df396e2254c8b0f25eff7d19c2e7f; >= 5e6bdd37c5526ef01326df5dabb93011ee89237e, < cddb447c62466f3076938ce120028d7b591f9f37; fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04; 5f7c9989f11305aaa43e0f4378f4f070022a9f2b; >= 5.4.26, < 5.5; >= 5.5.10, < 5.6
LinuxLinux5.6

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89458?
In the Linux kernel, the following vulnerability has been resolved: s390/dasd: Do not complete a failed ESE read as successful dasd_int_handler() completes an NRF read of an unallocated ESE track by calling ese_read() and unconditionally marking the request DASD_CQR_SUCCESS. dasd_eckd_ese_read() can return an error before it has zeroed the destination buffer: a failed sense-data parse or a current track outside the requested range both return early, leaving the destination pages untouched. The request is still completed successfully, so the block layer is handed stale / uninitialized memory instead of zeros. Check the ese_read() return value and fail the request through the normal error path instead of forcing DASD_CQR_SUCCESS.
How severe is CVE-2026-89458?
Severity scoring for CVE-2026-89458 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89458?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST