Linux Kernel Missing Initialization of a Variable Vulnerability
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.
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
Read at CISA Known Exploited Vulnerabilities catalog
- Vendor
- Linux kernel
- Product
- Kernel
- EPSS
- 0.16 (p97)
- CISA KEV
- added 28 Oct 2026, due 31 Oct 2026 (1d overdue)
- Exploitation
- observed in the wild
- Fix
- available
- Weakness
- CWE-456
- Exposure class
- Operating system
Why it ranks 86 (Critical)
- CISA KEV listed, remediation due 2026-10-31
- EPSS 0.10 (elevated)
- Product class: operating system
- Widely deployed vendor product (Linux kernel)
- Covered by 5 independent sources
- Fix available
- Government advisory
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- CISA Known Exploited Vulnerabilities catalog (nvd.nist.gov)
- Vendor advisory (git.kernel.org)
- CVE-2026-46300 on this site · NVD · CVE.org · Vulnpedia · KEV
Related coverage
Other items that share a CVE or were clustered with this one.