Is CVE-2026-31431 actively exploited?

Yes. KEV Intelligence tracks CVE-2026-31431 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2026-31431. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2026-31431 affects Linux Linux. KEV Intelligence lists 72 version rows; examples include 0:6.12.0-211.6.el10nv to < *, 0:6.12.0-231.12.el10nv to < *, and 0:6.12.0-124.55.1.el10_1 to < *.

Yes. CVE-2026-31431 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 1 day ahead of CISA.

CVE-2026-31431 Exploited in the Wild — Linux

Q: How should organizations remediate it?

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

Q: Is it in CISA KEV?

Yes. CVE-2026-31431 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. KEV Intelligence attested it 1 day ahead of CISA.

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

Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Before * Affected

Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Before * Affected

Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Before * Affected

Linux Linux Before 893d22e0135fa394db81df88697fba6032747667 Affected

Linux Linux Before 19d43105a97be0810edbda875f2cd03f30dc130c Affected

Linux Linux Before 961cfa271a918ad4ae452420e7c303149002875b Affected

Linux Linux Before 3115af9644c342b356f3f07a4dd1c8905cd9a6fc Affected

Linux Linux Before 8b88d99341f139e23bdeb1027a2a3ae10d341d82 Affected

Linux Linux Before fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8 Affected

Linux Linux Before ce42ee423e58dffa5ec03524054c9d8bfd4f6237 Affected

Linux Linux Before a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 Affected

Linux Linux 4.14 Affected

Linux Linux Before 4.14 Unaffected

Linux Linux Through 5.10.* Unaffected

Linux Linux Through 5.15.* Unaffected

Linux Linux Through 6.1.* Unaffected

Linux Linux Through 6.6.* Unaffected

Linux Linux Through 6.12.* Unaffected

Linux Linux Through 6.18.* Unaffected

Linux Linux Through 6.19.* Unaffected

Linux Linux Through * Unaffected

Published: 22 Apr 2026
Exploitation Reported: 01 Jun 2026
Attack vector: Local
Complexity: Low
Privileges: Low
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-31431
git.kernel.org/stable/c/893d22e0135fa394db81df88697fba60327... git.kernel.org · CVE Record https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667
git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30d... git.kernel.org · CVE Record https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c
git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c30314900... git.kernel.org · CVE Record https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b
git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd... git.kernel.org · CVE Record https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc
git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d3... git.kernel.org · CVE Record https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82
git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9... git.kernel.org · CVE Record https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8
git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4... git.kernel.org · CVE Record https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237
git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec70... git.kernel.org · CVE Record https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5

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.

Learn about Pro API access

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

02 Jun 2026
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
01 Jun 2026
Added to KEV Intelligence KEV Feed

High-confidence, third-party attested exploitation
05 May 2026
Public PoC available

Public proof-of-concept code published
22 Apr 2026
CVE published

Vulnerability disclosed publicly
09 Mar 2026
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 }
}

CVE-2026-31431

What security teams need to know first

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

Tags

CVE References

Why KEV Intelligence marks this CVE as exploited

Exploited in the wild

Proof of concept available

Known exploited vulnerability sources

Operational artifacts and observed signals

Observed signals

Scanner coverage

Virtual patch status

Severity, weaknesses, and research context

Weaknesses

ABB Ability Edgenius

All Mentions

Potential Proof of Concepts

From disclosure to observed exploitation

Added to CISA KEV

Added to KEV Intelligence KEV Feed

Public PoC available

CVE published

CVE ID reserved

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