Actively exploitedCVSS 7.8 · HIGH

CVE-2026-31431

Linux Kernel contains an incorrect resource transfer between spheres vulnerability that could allow for privilege escalation.

View on NVD

Analysis

A vulnerability in the Linux kernel crypto subsystem is being actively exploited to allow privilege escalation. Because this affects core infrastructure used across almost all cloud and server environments, immediate patching via your distribution provider is recommended.

Severity

Score: 7.8(HIGH)

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

AV: LOCAL

AC: LOW

PR: LOW

UI: NONE

S: UNCHANGED

C: HIGH

I: HIGH

A: HIGH

Weakness (CWE): CWE-669

CISA KEV

Added to KEV: 2026-05-01

Federal patch deadline: 2026-05-15

Known ransomware use: Unknown

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.

EPSS

Probability of exploitation (next 30 days): 0.0257 (2.6%)

Percentile: 85.7%

EPSS: 2026-05-21

Affects

linux:linux_kernelredhat:openshift_container_platformredhat:enterprise_linuxamazon:amazon_linuxcanonical:ubuntu_linuxdebian:debian_linuxopensuse:leapsuse:caas_platformsuse:enterprise_storagesuse:manager_proxysuse:manager_retail_branch_serversuse:manager_serversuse:openstack_cloudsuse:openstack_cloud_crowbarsuse:basesystem_modulesuse:development_tools_modulesuse:legacy_modulesuse:linux_enterprise_desktopsuse:linux_enterprise_high_availability_extensionsuse:linux_enterprise_high_performance_computingsuse:linux_enterprise_live_patchingsuse:linux_enterprise_microsuse:linux_enterprise_real_timesuse:linux_enterprise_serversuse:linux_enterprise_workstation_extensionsuse:linux_microsuse:public_cloud_modulesuse:realtime_modulenixos:nixosarista:cloudvision_agniarista:cloudvision_portalarista:velocloud_edgearista:velocloud_gatewayvmware:velocloud_orchestratorarista:netvisor_ossiemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfp_firmwaresiemens:simatic_s7-1500_cpu_1518-4_pn\/dp_mfpsiemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfp_firmwaresiemens:simatic_s7-1500_cpu_1518f-4_pn\/dp_mfpsiemens:siplus_s7-1500_cpu_1518-4_pn\/dp_mfp_firmwaresiemens:siplus_s7-1500_cpu_1518-4_pn\/dp_mfpsiemens:simatic_s7-1500_tm_mfp_firmwaresiemens:simatic_s7-1500_tm_mfp

Technical 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.

Published: 4/22/2026, 9:16:21 AM

Last modified: 5/21/2026, 7:52:35 PM

References

How to read this card

Actively exploited

KEV (Known Exploited Vulnerabilities) is CISA's catalog of CVEs confirmed as actively exploited in the real world. If a CVE is on KEV, someone is already using it in attacks.

CVSS 10.0

CVSS 10.0 — máxima severidad teórica. Explotable de forma remota, sin privilegios, con impacto total. Aún no confirmada como explotada en el mundo real, pero parchea ya.

AI-recommended

Un modelo de lenguaje revisó el CVE y consideró que afecta a software ampliamente desplegado o herramientas comunes de desarrollo. Un humano del equipo aprobó la publicación antes de que llegara aquí.

Categorías de impacto que evalúa la IA

widely_deployed_infra — kernel Linux, OpenSSL, glibc, k8s, Docker, nginx, OpenSSH.

popular_dev_tooling — Node.js, Python, Go, React, Next.js, librerías comunes de npm/pip.

common_consumer_software — Chrome, Firefox, Windows, macOS, apps móviles populares.

enterprise_saas — GitHub, GitLab, Atlassian, Salesforce, Cisco, Fortinet, Ivanti.

niche_software — CMS regionales, herramientas de hobby, librerías de poco uso.

not_relevant — firmware específico de proveedor, software descontinuado.

EPSS — EPSS (Exploit Prediction Scoring System) by FIRST.org estimates the probability that a CVE will be exploited in the next 30 days. Range is 0 to 1; very fresh CVEs typically score low until evidence accumulates.