s390/dasd: Do not complete a failed ESE read as successful

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Summary

CVECVE-2026-89458
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:26 UTC
Updated2026-09-11 20:19:26 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5e6bdd37c5526ef01326df5dabb93011ee89237e c9adf8399732306dfc97b3adb4778038743e3f5e git Not specified
CNA Linux Linux affected 5e6bdd37c5526ef01326df5dabb93011ee89237e 52b331c99baac653ca794bd8487c8ec4de8db203 git Not specified
CNA Linux Linux affected 5e6bdd37c5526ef01326df5dabb93011ee89237e b0d94dd6e82df396e2254c8b0f25eff7d19c2e7f git Not specified
CNA Linux Linux affected 5e6bdd37c5526ef01326df5dabb93011ee89237e cddb447c62466f3076938ce120028d7b591f9f37 git Not specified
CNA Linux Linux affected fbbacd0dcbc3ae9398c569dbea96ae4b5ad97e04 git Not specified
CNA Linux Linux affected 5f7c9989f11305aaa43e0f4378f4f070022a9f2b git Not specified
CNA Linux Linux affected 5.4.26 5.5 semver Not specified
CNA Linux Linux affected 5.5.10 5.6 semver Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/cddb447c62466f3076938ce120028d7b591f9f37 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c9adf8399732306dfc97b3adb4778038743e3f5e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/52b331c99baac653ca794bd8487c8ec4de8db203 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0d94dd6e82df396e2254c8b0f25eff7d19c2e7f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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