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.
- Vendor
- Linux
- Product
- Kernel
- CVSS
- 7.8
- EPSS (exploit probability)
- 10.2%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2026-46300 being exploited?
Yes. CISA added CVE-2026-46300 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 10.2% (scored October 28, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-28. Full cross-catalog view: /kev-comparison
CVE-2026-46300 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply 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.
US federal civilian agencies must remediate by (3 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Linux Kernel CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-53266 Linux Kernel Out-of-Bounds Write Vulnerabilitywrite-up | [ HIGH ] | 8.8 | 0.9% | |
| CVE-2025-39964 Linux Kernel Race Condition Vulnerabilitywrite-up | [ HIGH ] | 7.8 | 1.6% | |
| CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerabilitywrite-up | [ CRITICAL ] | 9.8 | 3.3% | |
| CVE-2026-53362 Linux Kernel Unspecified Vulnerability | [ HIGH ] | 7.8 | 0.7% | |
| CVE-2022-0995 Linux Kernel Out-of-Bounds Write Vulnerability | [ HIGH ] | 7.8 | 8.9% | |
| CVE-2026-53264 Linux kernel traffic-control subsystem use-after-free racewrite-up | [ HIGH ] | 7.8 | 0.5% | — |
| CVE-2022-0492 Linux Kernel Improper Authentication Vulnerability | [ HIGH ] | 7.8 | 5.5% | |
| CVE-2026-31431 Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability | [ HIGH ] | 7.8 | 98.1% |