CVE-2026-74466: s390/zcrypt: Close speculative mem read possibility

Received
AliasesUBUNTU-CVE-2026-74466DEBIAN-CVE-2026-74466
Published 15-08-2026Last modified 30-10-2026

Vulnerability summary

CVE-2026-74466 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 14% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.23%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
USN-8959-1USN-8960-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 30-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.22% on 06-10-2026

06-10-202605-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu142 products
  • linuxAll versions (No fix recorded) | < 7.0.0-42.42
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 7.0.0-1016.17
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.12.115-2 | < 7.1.8-1
Linux1 product
  • linux≥ cfd68b33094e1a92249850ff3c3c92ae9112a541, < 55ac533c568a5dcaa41cd26d6e089f9dff2a7c22 | ≥ cfd68b33094e1a92249850ff3c3c92ae9112a541, < dd1a334523ba533cba63caf593a7329d8e0e5e6e | ≥ cfd68b33094e1a92249850ff3c3c92ae9112a541, < d11a260bd7dfc6f6ccd43e1b930050f24e70cd5f | ≥ cfd68b33094e1a92249850ff3c3c92ae9112a541, < 59adeedebf02aa1c203de1d2b67ec45bfab7a3c6 | ≥ cfd68b33094e1a92249850ff3c3c92ae9112a541, < 82b62eda68abfb7a33ac40f24b8c4128c2891148 | ≥ cfd68b33094e1a92249850ff3c3c92ae9112a541, < e935cd525af4c6ed2e2c6404aa27ca19c7f39ddb | 5.18

3 vendors · 144 products

References

12 links
Show all 12 references