KEV Intelligence

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-31431

crypto: algif_aead - Revert to operating out-of-place

Linux / Linux · affected before *

View live feed Monitor via API Watch CVE
Severity
CVSS 7.8 · High
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
99.9%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-31431 is crypto: algif_aead - Revert to operating out-of-place affecting Linux Linux. In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Linux / Linux affected before *.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

crypto: algif_aead - Revert to operating out-of-place

In the Linux kernel, the following vulnerability has been resolved:

crypto: algif_aead - Revert to operating out-of-place

This mostly reverts commit 72548b093ee3 except for the copying of the associated data.

There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.

Vendor Product Affected Status
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions kpatch-patch All versions (default: unaffected) Unaffected
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support kernel Before * Unaffected
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support kpatch-patch All versions (default: unaffected) Unaffected
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support kernel Before * Unaffected
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support kpatch-patch All versions (default: unaffected) Unaffected
Red Hat Red Hat OpenShift Container Platform 4.12 rhcos Before * Unaffected
Red Hat Red Hat OpenShift Container Platform 4.13 rhcos Before * Unaffected
Red Hat Red Hat OpenShift Container Platform 4.14 rhcos Before * Unaffected
Red Hat Red Hat OpenShift Container Platform 4.15 rhcos Before * Unaffected
Red Hat Red Hat OpenShift Container Platform 4.16 rhcos Before * Unaffected
Red Hat Red Hat OpenShift Container Platform 4.17 rhcos Before * Unaffected
Red Hat Red Hat OpenShift Container Platform 4.18 rhcos Before * Unaffected
Red Hat Red Hat OpenShift Container Platform 4.19 rhcos Before * Unaffected
Red Hat Red Hat OpenShift Container Platform 4.20 rhcos Before * Unaffected
Red Hat Red Hat OpenShift Container Platform 4.21 rhcos Before * Unaffected
Red Hat Red Hat Enterprise Linux 6 kernel All versions (default: unaffected) Unaffected
Red Hat Red Hat Enterprise Linux 7 kernel All versions (default: unaffected) Unaffected
Red Hat Red Hat Enterprise Linux 7 kernel-rt All versions (default: unaffected) Unaffected
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Before * Affected
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Before * Affected
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Before * Affected
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Before * Affected
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Before * Affected
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Before * Affected
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Before * Affected
Published
22 Apr 2026
Exploitation Reported
01 Jun 2026
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None

Tags

cisa linux

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Proof of concept available

GitHub

Recorded 06 May 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
CVE First 2026-06-01 13:26 UTC
CISA 2026-06-02 14:01 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
0
User-Agents
0

Raw values available in Pro and Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

99.9%

Weaknesses

Improper Validation of Consistency within Input CWE-1288 Incorrect Resource Transfer Between Spheres CWE-669

Recent mention · All CISA Advisories

ABB Ability Edgenius

View CSAF Summary ABB is aware of public reports of a vulnerability CVE‑2026‑31431 (Copy Fail) in the product versions listed as affected in the advisory. An update is available that resolves a publicly reported vulnerability. CVE‑2026‑31431 (Copy Fail) is a Linux kernel...

Read full advisory

All Mentions

Recent mention · All CISA Advisories

ABB Ability Edgenius

All CISA Advisories · 14 Jul 2026

View CSAF Summary ABB is aware of public reports of a vulnerability CVE‑2026‑31431 (Copy Fail) in the product versions listed as affected in the advisory. An update is available that resolves a publicly reported vulnerability. CVE‑2026‑31431 (Copy Fail) is a Linux kernel vulnerability that may allow a locally authenticated user or compromised container workload to gain elevated (root) privileges on affected systems. Once root access is obtained, the attacker can effectively gain complete control of the system The following versions of ABB Ability Edgenius are affected: Ability Edgenius...

Recent mention · All CISA Advisories

Impact of Linux Kernel vulnerabilities on B&R products

All CISA Advisories · 23 Jun 2026

View CSAF Summary B&R is aware of publicly reported vulnerabilities affecting the Linux kernel versions shipped with the products listed as affected in the advisory. Successful local exploitation of these vulnerabilities could allow an attacker to escalate privileges on the affected system. Public proof-of-concept exploits are available for the vulnerabilities described herein. At the time of publication of this advisory, B&R had no evidence of active exploitation targeting B&R products. The following versions of Impact of Linux Kernel vulnerabilities on B&R products are affected: Linux...

Recent mention · Juniper Security Advisories

2026-05 Reference Advisory: Status of Copy Fail vulnerability on Juniper Products (CVE-2026-31431)

Juniper Security Advisories · 01 Jun 2026

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

dev1681/CVE-2026-31431

github · Created 2026-08-04 16:38:07 UTC · 0 stars · AI assessment 90%

copyfail poc here

TrevoCastles/CVE-2026-31431-copy-fail

github · Created 2026-08-02 23:15:19 UTC · 0 stars · AI assessment 85%

6abc/Copy-Fail-CVE-2026-31431-dirty-frag-CVE-2026-43284

github · Created 2026-05-05 02:50:48 UTC · 0 stars · AI assessment 85%

Timeline

From disclosure to observed exploitation

  1. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  3. Public PoC available

    Public proof-of-concept code published

  4. CVE published

    Vulnerability disclosed publicly

  5. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-31431

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-31431",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.99907,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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