CVE-2026-74466 PUBLISHED

s390/zcrypt: Close speculative mem read possibility

Assigner: Linux
Reserved: 15.08.2026 Published: 15.08.2026 Updated: 15.08.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from cfd68b33094e1a92249850ff3c3c92ae9112a541 to 82b62eda68abfb7a33ac40f24b8c4128c2891148 (excl.)
  • affected from cfd68b33094e1a92249850ff3c3c92ae9112a541 to e935cd525af4c6ed2e2c6404aa27ca19c7f39ddb (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 5.18 is affected
  • unaffected from 0 to 5.18 (excl.)
  • unaffected from 7.1.8 to 7.1.* (incl.)
  • unaffected from 7.2-rc6 to * (incl.)

References