CVE-2026-31431

Actively exploited (CISA KEV) High 7.8 CVSS 3.1

Description

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.

Description as published by the source, in English.

Key facts

Published: 2026-04-22
Last modified: 2026-09-08
Assigned by: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Scored by: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Probability of exploitation: 94.5 % among the highest of all known vulnerabilities
EPSS, next 30 days, model v2026.06.15
Fix available: Yes, see references

Actively exploited

CISA added this vulnerability to the Known Exploited Vulnerabilities catalogue on 2026-05-01, with a remediation deadline of 2026-05-15 for US federal agencies.

Required action: "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Affected products

Vendor	Product	Versions	Status
Amazon	Amazon Linux	all versions listed	Affected
Arista	Cloudvision Agni	≥ 2024.4.0, ≤ 2025.2.2	Affected
Arista	Cloudvision Portal	≥ 2024.2.0, ≤ 2026.1.0	Affected
Arista	Netvisor Os	< 7.1.0	Affected
Arista	Netvisor Os	7.1.0	Affected
Arista	Velocloud Edge	≥ 4.5.0, ≤ 6.4.1	Affected
Arista	Velocloud Gateway	all versions listed	Affected
Arista	Velocloud Orchestrator	all versions listed	Affected
Canonical	Ubuntu Linux	all versions listed	Affected
Canonical	Ubuntu Linux	14.04	Affected
Canonical	Ubuntu Linux	16.04	Affected
Canonical	Ubuntu Linux	18.04	Affected
Canonical	Ubuntu Linux	20.04	Affected
Canonical	Ubuntu Linux	22.04	Affected
Canonical	Ubuntu Linux	24.04	Affected
Canonical	Ubuntu Linux	25.10	Affected
Debian	Debian Linux	11.0	Affected
Debian	Debian Linux	12.0	Affected
Debian	Debian Linux	13.0	Affected
Linux	Linux Kernel	7.0	Affected
Linux	Linux Kernel	≥ 4.14, < 5.10.254	Affected
Linux	Linux Kernel	≥ 5.11, < 5.15.204	Affected
Linux	Linux Kernel	≥ 5.16, < 6.1.170	Affected
Linux	Linux Kernel	≥ 6.13, < 6.18.22	Affected
Linux	Linux Kernel	≥ 6.19, < 6.19.12	Affected
Linux	Linux Kernel	≥ 6.2, < 6.6.137	Affected
Linux	Linux Kernel	≥ 6.7, < 6.12.85	Affected
Nixos	Nixos	< 25.11	Affected
Opensuse	Leap	15.3	Affected
Opensuse	Leap	15.4	Affected
Opensuse	Leap	15.5	Affected
Opensuse	Leap	15.6	Affected
Redhat	Enterprise Linux	10.0	Affected
Redhat	Enterprise Linux	8.0	Affected
Redhat	Enterprise Linux	9.0	Affected
Redhat	Enterprise Linux Aus	8.4	Affected
Redhat	Enterprise Linux Aus	8.6	Affected
Redhat	Enterprise Linux Eus	10.0	Affected
Redhat	Enterprise Linux Eus	8.4	Affected
Redhat	Enterprise Linux Eus	9.4	Affected
Redhat	Enterprise Linux Eus	9.6	Affected
Redhat	Enterprise Linux Tus	8.6	Affected
Redhat	Enterprise Linux Tus	8.8	Affected
Redhat	Enterprise Linux Update Services For Sap Solutions	8.6	Affected
Redhat	Enterprise Linux Update Services For Sap Solutions	8.8	Affected
Redhat	Enterprise Linux Update Services For Sap Solutions	9.0	Affected
Redhat	Enterprise Linux Update Services For Sap Solutions	9.2	Affected
Redhat	Openshift Container Platform	4.0	Affected
Redhat	Openshift Container Platform	≥ 4.12, < 4.12.89	Affected
Redhat	Openshift Container Platform	≥ 4.13, < 4.13.66	Affected
Redhat	Openshift Container Platform	≥ 4.14, < 4.14.65	Affected
Redhat	Openshift Container Platform	≥ 4.15, < 4.15.64	Affected
Redhat	Openshift Container Platform	≥ 4.16, < 4.16.61	Affected
Redhat	Openshift Container Platform	≥ 4.17, < 4.17.53	Affected
Redhat	Openshift Container Platform	≥ 4.18, < 4.18.40	Affected
Redhat	Openshift Container Platform	≥ 4.19, < 4.19.30	Affected
Redhat	Openshift Container Platform	≥ 4.20, < 4.20.21	Affected
Redhat	Openshift Container Platform	≥ 4.21, < 4.21.14	Affected
Siemens	Simatic Ax Runtime	all versions listed	Affected
Siemens	Simatic Cn 4100	all versions listed	Not affected

Weakness type

CWE-1288: Improper Validation of Consistency within Input
The product receives a complex input with multiple elements or fields that must be consistent with each other, but it does not validate or incorrectly validates that the input is actually consistent.
CWE-669: Incorrect Resource Transfer Between Spheres
The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource.

References

https://git.kernel.org/stable/c/19d43105a97be0810edbda875f2cd03f30dc130c Patch
https://git.kernel.org/stable/c/3115af9644c342b356f3f07a4dd1c8905cd9a6fc Patch
https://git.kernel.org/stable/c/893d22e0135fa394db81df88697fba6032747667 Patch
https://git.kernel.org/stable/c/8b88d99341f139e23bdeb1027a2a3ae10d341d82 Patch
https://git.kernel.org/stable/c/961cfa271a918ad4ae452420e7c303149002875b Patch
https://git.kernel.org/stable/c/a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 Patch
https://git.kernel.org/stable/c/ce42ee423e58dffa5ec03524054c9d8bfd4f6237 Patch
https://git.kernel.org/stable/c/fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8 Patch
http://www.openwall.com/lists/oss-security/2026/04/29/23 Exploit, Mailing List, Patch
http://www.openwall.com/lists/oss-security/2026/04/29/25 Mailing List, Patch
http://www.openwall.com/lists/oss-security/2026/04/29/26 Exploit, Mailing List, Patch
http://www.openwall.com/lists/oss-security/2026/04/30/10 Mailing List, Patch
http://www.openwall.com/lists/oss-security/2026/04/30/11 Mailing List, Patch
http://www.openwall.com/lists/oss-security/2026/04/30/12 Mailing List, Patch
http://www.openwall.com/lists/oss-security/2026/04/30/14 Mailing List, Patch
http://www.openwall.com/lists/oss-security/2026/04/30/15 Mailing List, Patch
http://www.openwall.com/lists/oss-security/2026/04/30/16 Mailing List, Patch
http://www.openwall.com/lists/oss-security/2026/04/30/17 Mailing List
http://www.openwall.com/lists/oss-security/2026/04/30/18 Exploit, Mailing List
http://www.openwall.com/lists/oss-security/2026/04/30/2 Mailing List

Related at Berigo

Articles

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CVE-2026-31431 lets an ordinary user obtain root on most Linux distributions, and exploit code is already public.

Does this affect you?

A vulnerability matters only if you run the product, in an affected version, somewhere an attacker can reach.

Check your asset list Browse all vulnerabilities

Sources and freshness

CVE

What it is: A reference number naming one specific vulnerability, for example CVE-2024-9474.
What it tells you: Which vulnerability we are talking about, and in which product.
What it does NOT tell you: Nothing about how serious it is, whether anyone is exploiting it, or whether it concerns you.
Why it matters: Without a shared number, vendor, authority and tooling cannot discuss the same flaw.
Used with the others: The number is the key. NVD, KEV and EPSS all describe the same CVE.

NVD CWE CISA KEV EPSS

How to read this together

No single value should be used on its own. A high CVSS score does not mean a vulnerability is being exploited, and a low one does not mean it is harmless. The four sources answer four different questions.

CVE names the specific vulnerability.
NVD adds severity and technical detail about it.
CWE describes the type of mistake behind it.
CISA KEV shows that it is already being exploited.
EPSS estimates how likely exploitation is soon.

The order that decides what is urgent

Do you actually have the product?
Is the version you run affected?
Is it listed in CISA KEV?
Does it have a high EPSS score?
Is the system reachable from the internet or from others?
How important is the system to the business?
Are there compensating controls already in place?

The first two questions are not about the vulnerability at all. They are about you, and they remove most of the list before you start.

A short example

Fix this week

CVSS 6,5 (medium)

In CISA KEV: yes
EPSS: 94 per cent
A firewall facing the internet

Can be scheduled

CVSS 9,8 (critical)

In CISA KEV: no
EPSS: 0,04 per cent
A test server with no internet access

Sorted by CVSS alone, the one on the right comes first. It is the more serious flaw in theory. But the one on the left is being used against real organisations right now, and it sits where an attacker can reach it. That is the one to fix first.

The critical one still has to be fixed. It just does not have to be fixed today.

This product uses the NVD API but is not endorsed or certified by the NVD. CVE and the CVE logo are registered trademarks of The MITRE Corporation; CVE records are used under the CVE Terms of Use. CWE is a trademark of The MITRE Corporation, used per the CWE Terms of Use. KEV data from CISA (CC0). Exploitation probability from EPSS, a FIRST.org project. Open-source package data from OSV and the GitHub Advisory Database (CC-BY 4.0).

Scores and vectors are shown as published by the sources. The ordering of results is Berigo's own editorial assessment, described on the search page, and is not NVD data. An empty result never means a system is safe.