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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 55ac533c568a5dcaa41cd26d6e089f9dff2a7c22, 59adeedebf02aa1c203de1d2b67ec45bfab7a3c6, 82b62eda68abfb7a33ac40f24b8c4128c2891148.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 55ac533c568a5dcaa41cd26d6e089f9dff2a7c22, 59adeedebf02aa1c203de1d2b67ec45bfab7a3c6, 82b62eda68abfb7a33ac40f24b8c4128c2891148 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.18affected
    • cfd68b33094e1a92249850ff3c3c92ae9112a541 and later · before 55ac533c568a5dcaa41cd26d6e089f9dff2a7c22affected · git
    • cfd68b33094e1a92249850ff3c3c92ae9112a541 and later · before dd1a334523ba533cba63caf593a7329d8e0e5e6eaffected · git
    • cfd68b33094e1a92249850ff3c3c92ae9112a541 and later · before d11a260bd7dfc6f6ccd43e1b930050f24e70cd5faffected · git
    • cfd68b33094e1a92249850ff3c3c92ae9112a541 and later · before 59adeedebf02aa1c203de1d2b67ec45bfab7a3c6affected · git
    • cfd68b33094e1a92249850ff3c3c92ae9112a541 and later · before 82b62eda68abfb7a33ac40f24b8c4128c2891148affected · git
    • cfd68b33094e1a92249850ff3c3c92ae9112a541 and later · before e935cd525af4c6ed2e2c6404aa27ca19c7f39ddbaffected · git
    • before 5.18not affected · semver
    • 6.1.191 and later · up to and including 6.1.*not affected · semver
    • 6.6.160 and later · up to and including 6.6.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.115-26.12.115-2
Debian:14linuxbefore 7.1.8-17.1.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74464Aug 15, 2026 · net: openvswitch: fix skb leak on flow key update failure during ct
    0Monitor
  • ← EarlierCVE-2026-74465Aug 15, 2026 · net: openvswitch: fix potential UAF on meter attach failure
    31Monitor
  • Later →CVE-2026-74467Aug 15, 2026 · s390/qeth: Check CAP_NET_ADMIN for private ioctls
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux55ac533c568a5dcaa41cd26d6e089f9dff2a7c22Vendor (CNA)
Linux Linux59adeedebf02aa1c203de1d2b67ec45bfab7a3c6Vendor (CNA)
Linux Linux82b62eda68abfb7a33ac40f24b8c4128c2891148Vendor (CNA)
Linux Linuxd11a260bd7dfc6f6ccd43e1b930050f24e70cd5fVendor (CNA)
Linux Linuxdd1a334523ba533cba63caf593a7329d8e0e5e6eVendor (CNA)
Linux Linuxe935cd525af4c6ed2e2c6404aa27ca19c7f39ddbVendor (CNA)
debian:linux6.12.115-2 · Debian:13Package registry (OSV)
debian:linux7.1.8-1 · Debian:14Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records