A SHORTER WAY INTO THE SOURCE
The source, in brief.
This security brief organizes the matching CISA catalog record into a short reading view. The details below describe the catalog entry, not an assessment of your systems.
Abridged primary-source text [2]
Linux Kernel contains a missing initialization of a variable vulnerability that could allow for unintended modification of page-cache-backed data via failure to preserve the shared-fragment marker during socket buffer coalescing, causing ESP input processing to decrypt shared fragments in place. This vulnerability can be chained with CVE-2026-109618 and CVE-2026-109619 to implant PHP webshells and run commands as root.
This automated digest uses the approved primary record identified below. The excerpt is abridged source text, rather than original reporting or an AI-written paraphrase.
FROM THE PRIMARY RECORD
Key details.
- CVE
- CVE-2026-46300 [2]
- Vendor
- Linux [2]
- Product
- Kernel [2]
- CISA required action
- 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. [2]
- Federal agency due date
- 2026-10-31 [2]