CVE-2026-80543

Kernel-memory exposure via uninitialized alignment padding

Published Aug 26, 2026 · Updated Aug 26, 2026

Information disclosure in Linux 7.1 s390/zcrypt allows local users to forward up to three kernel-memory bytes to crypto-card firmware. xcrb_msg_to_type6cprb_msgx() and xcrb_msg_to_type6_ep11cprb_msgx() copy the user message length but send a four-byte-aligned buffer without initializing the trailing gap. Access requires local low privileges and an s390 system using CCA or EP11 crypto-card processing; the exposed data is limited to the padding gap.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux 7.1 s390/zcrypt allows local users to forward up to three kernel-memory bytes to crypto-card firmware. xcrb_msg_to_type6cprb_msgx() and xcrb_msg_to_type6_ep11cprb_msgx() copy the user message length but send a four-byte-aligned buffer without initializing the trailing gap. Access requires local low privileges and an s390 system using CCA or EP11 crypto-card processing; the exposed data is limited to the padding gap.

The record

CVE
CVE-2026-80543
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.1
  2. Affected versionversion=e2c6d91eb8b1533753755f07803e47eceed263d0 <2db92a56b000173d332b6c30f38a5a4444e4355a
  3. Affected versionversion=e2c6d91eb8b1533753755f07803e47eceed263d0 <eb363254472493e3458156fc11fd56dca92f4333

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=e2c6d91eb8b1533753755f07803e47eceed263d0 <2db92a56b000173d332b6c30f38a5a4444e4355a; version=e2c6d91eb8b1533753755f07803e47eceed263d0 <eb363254472493e3458156fc11fd56dca92f4333

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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