Bug 2517012 (CVE-2026-74466) - CVE-2026-74466 kernel: s390/zcrypt: Close speculative mem read possibility
Summary: CVE-2026-74466 kernel: s390/zcrypt: Close speculative mem read possibility
Keywords:
Status: NEW
Alias: CVE-2026-74466
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-15 12:44 UTC by OSIDB Bzimport
Modified: 2026-08-21 10:53 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-08-15 12:44:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

s390/zcrypt: Close speculative mem read possibility

The domain value is extracted from a given CCA or EP11 ioctl struct
when a CPRB is about to be sent. Thus this is a user controlled value.
Under some special conditions (custom device node used, administrative
load) this value is used as an array index after bounds checking, but
without speculation barrier.

Add the missing array_index_nospec() call to prevent speculative
execution where this domain value is used.
Comment 1 gkamathe 2026-08-21 10:48:30 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081533-CVE-2026-74466-e525@gregkh/T
Note You need to log in before you can comment on or make changes to this bug.