Exploited CVEs / Linux / CVE-2026-31431
CVE-2026-31431
Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-05-15 (that deadline has passed); treat that date as the outer bound for your own environment. Check the vendor security advisory for the fix.
Actively exploited Linux Kernel vulnerability, High severity, CVSS 7.8. Added to the CISA KEV catalog 2026-05-01.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2026-31431
A 96% EPSS score on a Linux kernel crypto flaw is rare: this algif_aead issue affects Azure Linux 3.0 and CBL Mariner 2.0 kernels and has been exploited in the wild since its 2026-05-01 KEV entry. A kernel bug at CVSS 7.8 in this class means local privilege escalation to root on unpatched hosts.
Do this: Roll updated kernels to Azure Linux and CBL Mariner systems and reboot them so the fix takes effect.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-31431
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-31431
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2026-05-15 (past due).
"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2026-31431
Check the vendor's security advisory channel for the patched Kernel versions and workarounds.
Common questions about CVE-2026-31431
Is CVE-2026-31431 actively exploited?
Yes. CVE-2026-31431 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-05-01, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 95%.
What is the CISA deadline and required action for CVE-2026-31431?
CISA set the federal (BOD 22-01) remediation due date at 2026-05-15, which has passed; treat any unremediated system as overdue. The verbatim 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.
What fixes CVE-2026-31431?
Check the vendor's security advisory for the patched Kernel versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2026-31431?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-31431's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
