Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-31431

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

Linux · affected before *

Watch CVE-2026-31431 Browse KEV feed
Severity
CVSS 7.8 · High
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
3.4%
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. In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

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.

Red Hat Unaffected
NVIDIA for RHEL 10 kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 10 kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 10.0 Extended Update Support kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8 kernel-rt
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8 kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8 kpatch-patch
All versions (default: unaffected)
Red Hat Unaffected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8.6 Telecommunications Update Service kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions kpatch-patch
All versions (default: unaffected)
Red Hat Unaffected
Red Hat Enterprise Linux 8.8 Telecommunications Update Service kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions kpatch-patch
All versions (default: unaffected)
Red Hat Unaffected
Red Hat Enterprise Linux 9 kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 9 kpatch-patch
All versions (default: unaffected)
Red Hat Unaffected
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions kernel-rt
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions kpatch-patch
All versions (default: unaffected)
Red Hat Unaffected
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions kernel-rt
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions kpatch-patch
All versions (default: unaffected)
Red Hat Unaffected
Red Hat Enterprise Linux 9.4 Extended Update Support kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 9.4 Extended Update Support kpatch-patch
All versions (default: unaffected)
Red Hat Unaffected
Red Hat Enterprise Linux 9.6 Extended Update Support kernel
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 9.6 Extended Update Support kpatch-patch
All versions (default: unaffected)
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.12 rhcos
Before *
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.13 rhcos
Before *
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.14 rhcos
Before *
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.15 rhcos
Before *
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.16 rhcos
Before *
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.17 rhcos
Before *
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.18 rhcos
Before *
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.19 rhcos
Before *
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.20 rhcos
Before *
Red Hat Unaffected
Red Hat OpenShift Container Platform 4.21 rhcos
Before *
Red Hat Unaffected
Red Hat Enterprise Linux 6 kernel
All versions (default: unaffected)
Red Hat Unaffected
Red Hat Enterprise Linux 7 kernel
All versions (default: unaffected)
Red Hat Unaffected
Red Hat Enterprise Linux 7 kernel-rt
All versions (default: unaffected)
Siemens Affected
SIMATIC AX Runtime Core Linux Common Debian
Before *
Siemens Affected
SIMATIC AX Runtime Core Linux Common Debian arm64
Before *
Siemens Affected
SIMATIC AX Runtime Core Linux Platform Container Common Debian Development
Before *
Siemens Affected
SIMATIC AX Runtime Core Linux VMWare Development
Before *
Siemens Affected
SIMATIC CN 4100
Before V6.0
Siemens Affected
SIMATIC HMI MTP1000 Unified Basic
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1000 Unified Comfort Panel
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1000 Unified Comfort Panel hygienic
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1000 Unified Comfort Panel hygienic neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1000, Unified Comfort Panel neutral
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Comfort Pro for stand (expandable, flange at the bottom)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Comfort Pro for support arm (expandable, round tube) and extension unit
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Comfort Pro for support arm (not extendable, flange on top)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Comfort Pro neutral design for stand (expandable, flange at the bottom)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Comfort Pro neutral design for support arm (expandable, round tube) and extension
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Comfort Pro neutral design for support arm (not extendable, flange on top)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Unified Basic
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Unified Comfort Panel
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Unified Comfort Panel hygienic
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Unified Comfort Panel hygienic neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1200 Unified Comfort Panel neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Comfort Pro for stand (expandable, flange at the bottom)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Comfort Pro for support arm (expandable, round tube) and extension unit
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Comfort Pro for support arm (not extendable, flange on top)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Comfort Pro neutral design for stand (expandable, flange at the bottom)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Comfort Pro neutral design for support arm (expandable, round tube) and extension
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Comfort Pro neutral design for support arm (not extendable, flange on top)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Unified Comfort Panel
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Unified Comfort Panel hygienic
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Unified Comfort Panel hygienic neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1500 Unified Comfort Panel neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Comfort Pro for stand (expandable, flange at the bottom)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Comfort Pro for support arm (expandable, round tube) and extension unit
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Comfort Pro for support arm (not extendable, flange on top)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Comfort Pro neutral design for stand (expandable, flange at the bottom)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Comfort Pro neutral design for support arm (expandable, round tube) and extension
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Comfort Pro neutral design for support arm (not extendable, flange on top)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Unified Comfort Panel
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Unified Comfort Panel hygienic
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Unified Comfort Panel hygienic neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP1900 Unified Comfort Panel neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Comfort Pro for stand (expandable, flange at the bottom)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Comfort Pro for support arm (expandable, round tube) and extension unit
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Comfort Pro for support arm (not extendable, flange on top)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Comfort Pro neutral design for stand (expandable, flange at the bottom)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Comfort Pro neutral design for support arm (expandable, round tube) and extension
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Comfort Pro neutral design for support arm (not extendable, flange on top)
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Unified Comfort Hygienic
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Unified Comfort Hygienic neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Unified Comfort Panel
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP2200 Unified Comfort Panel neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP400 Unified Basic
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP700 Unified Basic
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP700 Unified Comfort Panel
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP700 Unified Comfort Panel hygienic neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC HMI MTP700, Unified Comfort Panel neutral design
Before V21 Update 2 SR1
Siemens Affected
SIMATIC IoT2050 Advanced
Before *
Siemens Affected
SIMATIC IPC Industrial Edge Device OS (IED-OS)
Before *
Siemens Affected
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
Before V3.1.7 Before *
Siemens Affected
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Before V3.1.7 Before *
Siemens Affected
SIMATIC S7-1500 TM MFP
Before *
Siemens Affected
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Before *
Siemens Affected
SIPLUS HMI MTP1000 Unified Basic
Before V21 Update 2 SR1
Siemens Affected
SIPLUS HMI MTP1000 Unified Comfort
Before V21 Update 2 SR1
Siemens Affected
SIPLUS HMI MTP1200 Unified Basic
Before V21 Update 2 SR1
Siemens Affected
SIPLUS HMI MTP1200 Unified Comfort
Before V21 Update 2 SR1
Siemens Affected
SIPLUS HMI MTP400 Unified Basic
Before V21 Update 2 SR1
Siemens Affected
SIPLUS HMI MTP700 Unified Basic
Before V21 SP2 Update 1
Siemens Affected
SIPLUS HMI MTP700 Unified Comfort
Before V21 Update 2 SR1
Siemens Affected
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Before V3.1.7 Before *
Linux Affected
Linux
Before 893d22e0135fa394db81df88697fba6032747667 Before 19d43105a97be0810edbda875f2cd03f30dc130c Before 961cfa271a918ad4ae452420e7c303149002875b Before 3115af9644c342b356f3f07a4dd1c8905cd9a6fc Before 8b88d99341f139e23bdeb1027a2a3ae10d341d82 Before fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8 Before ce42ee423e58dffa5ec03524054c9d8bfd4f6237 Before a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 4.14
Linux Unaffected
Linux
Before 4.14 Through 5.10.* Through 5.15.* Through 6.1.* Through 6.6.* Through 6.12.* Through 6.18.* Through 6.19.* Through *
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 Previdian 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

A trusted third party reported exploitation.

Proof of concept available

GitHub

Recorded 05 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 Previdian 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
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian 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

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

3.4%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

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.

silentbyte69/copy-fail-CVE-2026-31431-cpp

github · Created 2026-09-04 16:35:59 UTC · 0 stars · AI assessment 85%

https://github.com/theori-io/copy-fail-CVE-2026-31431 but ported to c++ for fun

byt3l0rd/CVE-2026-31431

github · Created 2026-09-03 10:09:48 UTC · 0 stars · AI assessment 90%

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%

SilverRuler/copy-fail-CVE-2026-31431

github · Created 2026-05-13 14:43:00 UTC · 0 stars · AI assessment 85%

copy-fail-CVE-2026-31431

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%

CVE Record exploit — github.com

cve · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 14:01 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. 13:26 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  3. 02:50 UTC

    Public PoC available

    Public proof-of-concept code published

  4. 08:15 UTC

    CVE published

    Vulnerability disclosed publicly

  5. 15:48 UTC

    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.

Start 14-day Pro trial Read API docs
  • 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": 0.03437,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}