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NVD / CVE Program· CNA Linux

CVE-2026-80543: s390/zcrypt: Pad trailing CCA or EP11 message with zeros

—No exploit Fix available

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 2db92a56b000173d332b6c30f38a5a4444e4355a, 44e61f1834831f873af5a4fec5a5e432b929c6a2, 6.13.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2db92a56b000173d332b6c30f38a5a4444e4355a, 44e61f1834831f873af5a4fec5a5e432b929c6a2, 6.13 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: Pad trailing CCA or EP11 message with zeros The both functions xcrb_msg_to_type6cprb_msgx() and xcrb_msg_to_type6_ep11cprb_msgx() copy the user space message into a kernel buffer based on the message length. But on further processing the message is supposed to be 4 byte length adjusted. Thus up to 3 bytes of uninitialized kernel memory are forwarded to further processing steps and may unwanted expose kernel memory to the crypto card firmware. This patch contains code to pad the gap between user space copied message and message buffer length sent down to further processing of the CCA or EP11 message to zeros.

Published
Aug 26, 2026
Updated
Oct 21, 2026
EPSS
0.2% · 10th 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 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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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

    • f9da85d4780515f65983e0af151458599adaef3d, 7.1affected
    • 20b0b0159390fa5c00a435195649680fefda81e0 and later · before 44e61f1834831f873af5a4fec5a5e432b929c6a2affected · git
    • e2c6d91eb8b1533753755f07803e47eceed263d0 and later · before 2db92a56b000173d332b6c30f38a5a4444e4355aaffected · git
    • e2c6d91eb8b1533753755f07803e47eceed263d0 and later · before eb363254472493e3458156fc11fd56dca92f4333affected · git
    • 6.12.114 and later · before 6.13affected · semver
    • before 7.1not affected · semver
    • 7.1.10 and later · up to and including 7.1.*not affected · semver
    • 7.2 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:14linuxbefore 7.1.10-17.1.10-1

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-2026-80540Aug 26, 2026 · drm/amdgpu: Fix UVD decode image min size calculation
    31Monitor
  • ← EarlierCVE-2026-80541Aug 26, 2026 · drm/amdgpu: validate GEM_CREATE domain combinations
    31Monitor
  • Later →CVE-2026-80544Aug 26, 2026 · s390/zcrypt: Improve EP11 CPRB domain handling with ASN.1 parsing
    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 Linux2db92a56b000173d332b6c30f38a5a4444e4355aVendor (CNA)
Linux Linux44e61f1834831f873af5a4fec5a5e432b929c6a2Vendor (CNA)
Linux Linux6.13Vendor (CNA)
Linux Linuxeb363254472493e3458156fc11fd56dca92f4333Vendor (CNA)
debian:linux7.1.10-1 · 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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.

References

Show all references (2 more)

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

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