Event Monitor Cyber
EM-20261028-HOHU VulnerabilityHigh severity

Linux Kernel Missing Initialization of a Variable Vulnerability

CVE-2026-46300 · Linux Kernel

0 hours from first report to confirmed exploitation.

Status
Confirmed

Since : CISA added it to Known Exploited Vulnerabilities.

First Signal
Oct 28 12:00 UTCC1 CISA Known Exploited Vulnerabilities
Page Born
Oct 28 12:00 UTCsecond source joined
Last Signal
Oct 28 12:00 UTC7 days before snapshot
Sources
22 official · 0 research, news or crowd
Open For
7 daysso far

Life Of This Page

  1. 1
    Born
    A second, independent source names it.
  2. 2
    Developing
    New signals join; severity can move.
  3. 3
    Confirmed · Now
    CISA KEV lists it, or exploitation in the wild is reported.
  4. 4
    Resolved
    Not yet
    Past the fix deadline and 14 days with no new signal.
  5. 5
    Archived
    Not yet
    30 days after resolved. Read only; the link keeps working. Reopens if it comes back.

The address and ID never change. A correction is logged, never overwritten. If two pages turn out to be one incident, the later one points to the earlier.

Vulnerability Lifecycle

  1. Disclosed: reached
    May 23 12:17 UTC
    C6 NVD published
  2. Scored: reached
    May 23 12:17 UTC
    CVSS 7.8 · EPSS 16.1%
  3. Exploited: reached
    Oct 28 12:00 UTC
    C1 CISA KEV, fix by 2026-10-31
  4. Advisories: reached
    Oct 28 12:00 UTC
    1 government and CERT sources
  5. Vendor Response: not yet
    Not yet
    None in sources yet
  6. Resolved: not yet
    Not yet
    When fixed: KEV deadline 2026-10-31, then 14 quiet days

Timeline

06:0008:0010:0012:0014:0016:0018:0020:0022:00Oct 29BornC1 CISA Known Exploited VulnerabilitC2 CISA Cybersecurity Advisories

Point at a mark to read it. Squares are signals, colored by severity; every one is also listed under Signals.

Signals

  1. CISA Add Two Known Exploited Vulnerabilitie to Catalog (opens source in a new tab) CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2026-41709 Broadcom VMWare ESX Insufficient Logging Vulnerability CVE-2026-46300… High severityGovernmentC2 CISA Cybersecurity Advisories
  2. CVE-2026-46300 added to KEV: Linux Kernel Mi ing Initialization of a Variable Vulnerability (opens source in a new tab) 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 co… High severityExploited ListC1 CISA Known Exploited Vulnerabilities