{"id":"EM-20261028-HOHU","url":"https://cyber.eventmonitor.net/incident/EM-20261028-HOHU/","type":"cve","title":"Linux Kernel Missing Initialization of a Variable Vulnerability","subtitle":"CVE-2026-46300","subject":"CVE-2026-46300","status":"Confirmed","severity":"high","affected":["Linux Kernel"],"headline":"0 hours from first report to confirmed exploitation.","born":"2026-10-28T12:00:00.000Z","firstSignal":"2026-10-28T12:00:00.000Z","lastSignal":"2026-10-28T12:00:00.000Z","updated":"2026-11-04T09:04:34.499Z","revision":2,"life":[{"status":"Born","at":"2026-10-28T12:00:00.000Z","why":"second independent source: C2 CISA Cybersecurity Advisories"},{"status":"Developing","at":"2026-10-28T12:00:00.000Z","why":"signals keep joining"},{"status":"Confirmed","at":"2026-10-28T12:00:00.000Z","why":"CISA added it to Known Exploited Vulnerabilities"}],"changeLog":[{"at":"2026-10-28T12:00:00.000Z","what":"First signal: C1 CISA Known Exploited Vulnerabilities"},{"at":"2026-10-28T12:00:00.000Z","what":"Born: second source, C2 CISA Cybersecurity Advisories. Page EM-20261028-HOHU created."},{"at":"2026-10-28T12:00:00.000Z","what":"Status: Confirmed (CISA added it to Known Exploited Vulnerabilities)"}],"stages":[{"name":"Disclosed","at":"2026-05-23T12:17:02.660Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-05-23T12:17:02.660Z","detail":"CVSS 7.8 · EPSS 16.1%"},{"name":"Exploited","at":"2026-10-28T12:00:00.000Z","detail":"C1 CISA KEV, fix by 2026-10-31"},{"name":"Advisories","at":"2026-10-28T12:00:00.000Z","detail":"1 government and CERT sources"},{"name":"Vendor Response","at":null,"detail":"None in sources yet"},{"name":"Resolved","at":null,"detail":"When fixed: KEV deadline 2026-10-31, then 14 quiet days"}],"signals":[{"at":"2026-10-28T12:00:00.000Z","source":"C1","sourceName":"CISA Known Exploited Vulnerabilities","role":"Exploited List","severity":3,"title":"CVE-2026-46300 added to KEV: Linux Kernel Mi ing Initialization of a Variable Vulnerability","text":"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.","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog"},{"at":"2026-10-28T12:00:00.000Z","source":"C2","sourceName":"CISA Cybersecurity Advisories","role":"Government","severity":3,"title":"CISA Add  Two Known Exploited Vulnerabilitie  to Catalog","text":"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 Linux Kernel Missing Initialization of a Variable Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks t","url":"https://www.cisa.gov/news-events/alerts/2026/10/28/cisa-adds-two-known-exploited-vulnerabilities-catalog"}],"crowd":[],"reference":{"nvd":{"published":"2026-05-23T12:17:02.660","score":7.8,"severity":"HIGH","desc":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: preserve shared-frag marker during coalescing\n\nskb_try_coalesce() can attach paged frags from @from to @to.  If @from\nhas SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same\nexternally-owned or page-cache","product":"Linux Kernel","seen":1793783074499},"kev":{"added":"2026-10-28","due":"2026-10-31","ransomware":"Unknown","vendor":"Linux","product":"Kernel","name":"Linux Kernel Missing Initialization of a Variable Vulnerability"},"epss":{"epss":0.1613,"pct":0.96932,"at":1793783074499},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}