P1 Verified

Linux Kernel Out-of-Bounds Write Vulnerability

CVE-2026-53266 affects Linux Kernel. EPSS 0.00827 (percentile 0.55987), scored 2026-10-03. Listed in CISA KEV, added 2026-09-18.

Summary source: template

CVE / CWE

CVE-2026-53266 / CWE-787

Vendor / product

Linux / Kernel

Severity

80.0

CVSS

Unavailable · ·

EPSS

0.00827 · percentile 0.55987 · 2026-10-03

KEV

yes · added 2026-09-18 · due 2026-09-21 · ransomware use Unknown

Exploit signals

kev: CISA KEV listing.

Signal evidence

Affected products

Required action — CISA

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Provenance

• CISA Known Exploited Vulnerabilities Catalog (JSON) · Source record · observed 2026-10-04 05:55:03.893835+00:00 UTC
• FIRST EPSS daily exploit-probability · Source record · observed 2026-10-04 05:55:10.544390+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-53266.html