{"id":36186,"date":"2026-07-05T16:50:00","date_gmt":"2026-07-05T14:50:00","guid":{"rendered":"https:\/\/www.chinasmartbuy.com\/blog\/linux-bad-epoll-cve-2026-46242-kernel-android\/"},"modified":"2026-07-05T16:50:02","modified_gmt":"2026-07-05T14:50:02","slug":"linux-bad-epoll-cve-2026-46242-kernel-android","status":"publish","type":"post","link":"https:\/\/www.chinasmartbuy.com\/blog\/linux-bad-epoll-cve-2026-46242-kernel-android\/","title":{"rendered":"Linux, falla Bad Epoll ad alto rischio: colpiti kernel 6.4+ e Android"},"content":{"rendered":"\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Bebas+Neue&amp;family=DM+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;1,400&amp;display=swap\" rel=\"stylesheet\">\n<style>\n  :root {\n    --red: #CC1B1B;\n    --red-light: rgba(204,27,27,0.08);\n    --red-mid: #e84040;\n    --accent-soft-bg: rgba(204,27,27,0.07);\n    --accent-soft-border: rgba(204,27,27,0.18);\n    --text: #1a1a1a;\n    --text-muted: #666;\n    --card: #ffffff;\n    --border: #ebebeb;\n    --page-bg: #ffffff;\n    --surface-soft: #fafafa;\n    --surface-contrast: #f0f0f0;\n    --line-soft: #f5f5f5;\n    --soft-label: #bbb;\n    --muted-label: #999;\n    --copy: #333;\n    --font-head: 'Bebas Neue', sans-serif;\n    --font-body: 'DM Sans', sans-serif;\n    --heading-spacing: 0.04em;\n    --heading-weight: 400;\n    --spec-header-spacing: 0.08em;\n    --quickfacts-shadow: 0 10px 24px rgba(15,23,42,0.06);\n  }\n  .fbp5-wrap,.fbp5-wrap * { box-sizing:border-box; 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}\n    .rh-downloadbox-link { width:100%; }\n    .rh-offerbox-head { flex-direction:column; }\n    .rh-offerbox-links { grid-template-columns:1fr; }\n    .rh-offer-inline-wrap { flex-direction:column; align-items:flex-start; }\n    .rh-offer-inline-cta { width:100%; }\n  }\n\n  \/* RH_FBP5_CARDS_CSS_V1 *\/\n  .fbp5-related-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }\n  .fbp5-telegram-grid { grid-template-columns:repeat(2,1fr); }\n  .fbp5-related-card { display:block; overflow:hidden; border:1px solid var(--border,#ebebeb); border-radius:8px; background:var(--card,#fff); color:inherit !important; text-decoration:none !important; transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease; }\n  .fbp5-related-card:hover { transform:translateY(-2px); border-color:rgba(204,27,27,.35); box-shadow:0 16px 36px rgba(18,18,18,.10); }\n  .fbp5-related-card img { display:block; width:100%; aspect-ratio:16\/9; object-fit:cover; background:var(--surface-soft,#fafafa); }\n  .fbp5-related-thumb-placeholder { width:100%; aspect-ratio:16\/9; display:flex; align-items:center; justify-content:center; background:linear-gradient(135deg,rgba(204,27,27,.10),rgba(204,27,27,.03)); color:var(--red,#CC1B1B); font-family:var(--font-head,'Bebas Neue',sans-serif); font-size:28px; letter-spacing:.04em; }\n  .fbp5-related-body { padding:12px; }\n  .fbp5-related-body span { display:block; margin:0 0 6px; color:var(--red,#CC1B1B); font-size:11px; font-weight:900; letter-spacing:.08em; text-transform:uppercase; }\n  .fbp5-related-body strong { display:block; font-size:15px; line-height:1.25; color:var(--text,#1a1a1a); }\n  .fbp5-related-body small { display:block; margin:7px 0 0; color:var(--text-muted,#666); font-size:13px; line-height:1.35; }\n  @media(max-width:720px) {\n    .fbp5-telegram-grid { grid-template-columns:1fr; }\n    .fbp5-related-grid:not(.fbp5-telegram-grid) { grid-template-columns:1fr; }\n    .fbp5-related-grid:not(.fbp5-telegram-grid) .fbp5-related-card { display:grid; grid-template-columns:112px minmax(0,1fr); align-items:stretch; }\n    .fbp5-related-grid:not(.fbp5-telegram-grid) .fbp5-related-card img,\n    .fbp5-related-grid:not(.fbp5-telegram-grid) .fbp5-related-thumb-placeholder { height:100%; min-height:92px; aspect-ratio:auto; }\n  }\n<\/style>\n<div class=\"fbp5-wrap rh-json-article\" id=\"rh-article-mr7wqosy-iimkg\" data-rh-article-type=\"news\" data-rh-site-profile=\"china-smart-buy\">\n  <div class=\"fbp5-intro\">\n    \n    <p>Nel kernel Linux \u00e8 emersa una nuova falla di sicurezza ad alto rischio chiamata <strong>Bad Epoll<\/strong>, classificata come CVE-2026-46242 e valutata con punteggio <strong>CVSS 7.8<\/strong>. Il problema interessa il sottosistema epoll del kernel e pu\u00f2 consentire a un attaccante locale di passare da utente normale a root, ottenendo il controllo completo del sistema.<\/p><p>La vulnerabilit\u00e0 coinvolge i sistemi basati su Linux 6.4 e versioni successive, inclusi desktop, server e anche Android. La correzione \u00e8 gi\u00e0 stata integrata nel ramo principale del kernel, ma la protezione effettiva dipende dalla distribuzione o dal produttore del dispositivo e dall&#8217;arrivo degli aggiornamenti di sicurezza.<\/p>\n  <\/div><figure class=\"wp-block-image size-large\" style=\"margin:18px 0;display:block;clear:both;width:100%;position:relative;z-index:1\"><a href=\"https:\/\/www.chinasmartbuy.com\/blog\/wp-content\/uploads\/2026\/07\/linux-falla-bad-epoll-ad-alto-rischio-b57a6b2c-f979-45fc-97a3-d6bc-1f4fjw1afu.webp\" target=\"_blank\" rel=\"noopener\" style=\"display:block;width:100%;position:relative;z-index:2;pointer-events:auto;cursor:zoom-in\"><img decoding=\"async\" src=\"https:\/\/www.chinasmartbuy.com\/blog\/wp-content\/uploads\/2026\/07\/linux-falla-bad-epoll-ad-alto-rischio-b57a6b2c-f979-45fc-97a3-d6bc-1f4fjw1afu.webp\" alt=\"Linux \u5185\u6838 epoll \u5b50\u7cfb\u7edf\u66dd\u672c\u5730\u63d0\u6743\u9ad8\u5371\u6f0f\u6d1e\u201cBad Epoll\u201d\uff1aCVSS \u8bc4\u5206 7.8\u3001\u6ce2\u53ca\u8c37\u6b4c\u5b89\u5353\u7cfb\u7edf\" loading=\"lazy\" style=\"display:block;max-width:100%;height:auto;margin:0 auto;pointer-events:auto\"><\/a><\/figure>\n  \n\n      <section class=\"fbp5-section\">\n        <div class=\"fbp5-section-label\">Sicurezza<\/div>\n        <h2>Bad Epoll colpisce Linux 6.4 e successivi con un&#8217;escalation <span>locale a root<\/span><\/h2>\n        <p>Bad Epoll nasce da una race condition nel sottosistema epoll che porta a una vulnerabilit\u00e0 di tipo use-after-free. In pratica, un processo con permessi normali pu\u00f2 sfruttare il difetto per ottenere privilegi root. \u00c8 un dettaglio tecnico importante perch\u00e9 non si parla di semplice crash o instabilit\u00e0, ma di una falla che pu\u00f2 aprire la strada al pieno controllo della macchina.<\/p><p>Il bug \u00e8 stato individuato nella prima met\u00e0 dell&#8217;anno dal ricercatore Jaeyoung Chung del laboratorio di sicurezza informatica dell&#8217;Universit\u00e0 Nazionale di Seul. Il difetto \u00e8 stato introdotto a partire da Linux 6.4, quindi i sistemi che restano su <strong>Linux 6.1<\/strong> non risultano coinvolti da questo specifico problema.<\/p>\n        <ul class=\"fbp5-bullet-list\"><li>Identificativo vulnerabilit\u00e0: <strong>CVE-2026-46242<\/strong>.<\/li><li>Gravit\u00e0: <strong>CVSS 7.8<\/strong>, classificazione ad alto rischio.<\/li><li>Tipo di attacco: escalation di privilegi locale.<\/li><li>Effetto potenziale: passaggio da utente standard a <strong>root<\/strong> con controllo completo del sistema.<\/li><li>Versioni coinvolte: kernel Linux <strong>6.4 o superiori<\/strong> non ancora corretti o senza backport della patch.<\/li><\/ul>\n        <div class=\"rh-quickfacts-grid\">\n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Sottosistema coinvolto<\/div>\n        <div class=\"rh-quickfacts-value\">epoll<\/div>\n      <\/div>\n    \n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Patch nel mainline<\/div>\n        <div class=\"rh-quickfacts-value\">Integrata a fine aprile<\/div>\n      <\/div>\n    <\/div>\n        <div class=\"fbp5-highlight\">Il punto pi\u00f9 critico \u00e8 che la falla consente un&#8217;escalation a root, uno scenario molto pi\u00f9 serio di un semplice bug di stabilit\u00e0.<\/div>\n        <div class=\"fbp5-info\">Le principali distribuzioni hanno gi\u00e0 pubblicato avvisi di sicurezza con l&#8217;elenco delle versioni interessate e lo stato delle correzioni.<\/div>\n        \n      <div class=\"fbp5-scheda\">\n        <div class=\"fbp5-scheda-header\">Dati chiave della vulnerabilit\u00e0<\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Nome<\/div>\n            <div class=\"fbp5-scheda-val\">Bad Epoll<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">CVE<\/div>\n            <div class=\"fbp5-scheda-val\">CVE-2026-46242<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Punteggio CVSS<\/div>\n            <div class=\"fbp5-scheda-val\">7.8<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Impatto<\/div>\n            <div class=\"fbp5-scheda-val\">Escalation locale dei privilegi fino a root<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Versione di introduzione<\/div>\n            <div class=\"fbp5-scheda-val\">Linux 6.4<\/div>\n          <\/div>\n        \n      <\/div>\n    \n      <\/section>\n    \n\n      <section class=\"fbp5-section\">\n        <div class=\"fbp5-section-label\">Android<\/div>\n        <h2>Anche Android \u00e8 coinvolto e i dispositivi con kernel pi\u00f9 recenti sono i pi\u00f9 esposti<\/h2>\n        <p>La vulnerabilit\u00e0 non si ferma al mondo desktop o server: interessa anche Android, dove il rischio \u00e8 particolarmente concreto. Un test di tipo proof of concept ha mostrato che un Pixel 10 basato su kernel <strong>Linux 6.6 o superiore<\/strong> pu\u00f2 essere colpito, mentre un Pixel 8 con kernel 6.1 non risulta vulnerabile a questo difetto specifico.<\/p><p>Il motivo per cui Bad Epoll viene considerata pericolosa su Android \u00e8 semplice: molte falle del kernel richiedono moduli specifici che sui dispositivi Android non sono caricati per impostazione predefinita, quindi restano poco sfruttabili. In questo caso, invece, epoll \u00e8 un meccanismo centrale del kernel e la superficie di attacco risulta pi\u00f9 realistica.<\/p>\n        <ul class=\"fbp5-bullet-list\"><li>Coinvolti anche gli smartphone Android basati su kernel Linux recenti.<\/li><li>PoC riuscita su <strong>Pixel 10<\/strong> con kernel 6.6 o superiore.<\/li><li>Non vulnerabile in questo caso <strong>Pixel 8<\/strong> con kernel 6.1.<\/li><li>Il rischio \u00e8 pi\u00f9 alto perch\u00e9 epoll \u00e8 una parte fondamentale del kernel e non un modulo opzionale.<\/li><\/ul>\n        <div class=\"rh-quickfacts-grid\">\n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Condizione principale<\/div>\n        <div class=\"rh-quickfacts-value\">Uso di kernel 6.4 o successivi<\/div>\n      <\/div>\n    <\/div>\n        <div class=\"fbp5-highlight\">Su Android Bad Epoll spicca perch\u00e9 rientra nel piccolo gruppo di bug del kernel realmente adatti a ottenere privilegi root.<\/div>\n        <div class=\"fbp5-info\">Tra i bug monitorati in kernelCTF, solo una quota ridotta permette davvero di arrivare a root, e Bad Epoll rientra in quella categoria.<\/div>\n        \n      <div class=\"fbp5-scheda\">\n        <div class=\"fbp5-scheda-header\">Impatto noto su Android<\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Piattaforma<\/div>\n            <div class=\"fbp5-scheda-val\">Android<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Scenario verificato<\/div>\n            <div class=\"fbp5-scheda-val\">Trigger della vulnerabilit\u00e0 tramite proof of concept<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Kernel coinvolti<\/div>\n            <div class=\"fbp5-scheda-val\">6.4 e successivi, con caso confermato su 6.6 o superiori<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Kernel esclusi<\/div>\n            <div class=\"fbp5-scheda-val\">6.1 nel caso dei dispositivi citati<\/div>\n          <\/div>\n        \n      <\/div>\n    \n      <\/section>\n    \n\n      <section class=\"fbp5-section\">\n        <div class=\"fbp5-section-label\">Aggiornamenti<\/div>\n        <h2>L&#8217;unica difesa concreta \u00e8 aggiornare subito il <span>kernel corretto<\/span><\/h2>\n        <p>Non ci sono contromisure temporanee davvero efficaci perch\u00e9 epoll \u00e8 un componente di base del kernel Linux e non pu\u00f2 essere semplicemente disattivato. Questo rende la gestione della falla molto diretta: se il sistema usa una versione vulnerabile, la protezione reale arriva solo con un kernel aggiornato che includa la patch.<\/p><p>Le distribuzioni principali, tra cui Red Hat, SUSE, Debian, Ubuntu e Amazon Linux, hanno gi\u00e0 diffuso avvisi di sicurezza con i dettagli sulle versioni colpite e sulle correzioni disponibili. Per chi gestisce PC, server o dispositivi Android, il dato pi\u00f9 importante \u00e8 verificare rapidamente la versione del kernel in uso e installare gli aggiornamenti appena disponibili.<\/p>\n        <ul class=\"fbp5-bullet-list\"><li>Non esiste una mitigazione temporanea semplice e affidabile.<\/li><li>La sola protezione concreta \u00e8 l&#8217;<strong>aggiornamento del kernel<\/strong> con la patch correttiva.<\/li><li>Distribuzioni gi\u00e0 attive con advisory: Red Hat, SUSE, Debian, Ubuntu e Amazon Linux.<\/li><li>I sistemi rimasti su Linux 6.1 non risultano colpiti da questa vulnerabilit\u00e0 specifica.<\/li><\/ul>\n        <div class=\"rh-quickfacts-grid\">\n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Mitigazione temporanea<\/div>\n        <div class=\"rh-quickfacts-value\">Assente<\/div>\n      <\/div>\n    \n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Soluzione raccomandata<\/div>\n        <div class=\"rh-quickfacts-value\">Installare il kernel corretto<\/div>\n      <\/div>\n    \n      <div class=\"rh-quickfacts-card\">\n        <div class=\"rh-quickfacts-label\">Priorit\u00e0<\/div>\n        <div class=\"rh-quickfacts-value\">Alta su sistemi Linux 6.4+<\/div>\n      <\/div>\n    <\/div>\n        <div class=\"fbp5-highlight\">In questo caso aggiornare non \u00e8 un consiglio generico: \u00e8 l&#8217;unica misura affidabile per chiudere davvero la falla.<\/div>\n        <div class=\"fbp5-info\">La presenza della patch nel kernel mainline non garantisce automaticamente la protezione di tutti i dispositivi, perch\u00e9 tempi e modalit\u00e0 dipendono dai singoli vendor.<\/div>\n        \n      <div class=\"fbp5-scheda\">\n        <div class=\"fbp5-scheda-header\">Cosa controllare subito<\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Versione kernel<\/div>\n            <div class=\"fbp5-scheda-val\">Verificare se \u00e8 6.4 o superiore<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Stato patch<\/div>\n            <div class=\"fbp5-scheda-val\">Controllare se la distribuzione ha gi\u00e0 effettuato il backport<\/div>\n          <\/div>\n        \n          <div class=\"fbp5-scheda-row\">\n            <div class=\"fbp5-scheda-key\">Azione<\/div>\n            <div class=\"fbp5-scheda-val\">Installare gli aggiornamenti di sicurezza disponibili<\/div>\n          <\/div>\n        \n      <\/div>\n    \n      <\/section>\n    \n<section class=\"fbp5-section\" data-rh-related-section=\"1\">\n      <div class=\"fbp5-section-label\">Articoli correlati<\/div>\n      <h2>Altre notizie <span>da leggere<\/span><\/h2>\n      <div class=\"fbp5-related-grid\"><a class=\"fbp5-related-card\" href=\"https:\/\/www.chinasmartbuy.com\/blog\/honor-smartphone-7-pollici-185hz-rumor\/\" target=\"_blank\" rel=\"noopener\">\n      <img decoding=\"async\" src=\"https:\/\/www.chinasmartbuy.com\/blog\/wp-content\/uploads\/2026\/07\/honor-68a8e96c-6a6e-45b2-b4ed-bb7d-j63oac1vly.webp\" alt=\"Honor, in sviluppo uno smartphone con schermo da 7 pollici e 185 Hz\" loading=\"lazy\">\n      <div class=\"fbp5-related-body\">\n        <span>smartphone<\/span>\n        <strong>Honor, in sviluppo uno smartphone con schermo da 7 pollici e 185 Hz<\/strong>\n        <small>Honor potrebbe essere al lavoro su uno smartphone con display OLED piatto da 7 pollici e refresh rate a 185 Hz.<\/small>\n      <\/div>\n    <\/a><a class=\"fbp5-related-card\" href=\"https:\/\/www.chinasmartbuy.com\/blog\/redmi-snapdragon-8e6-2nm-test-2027\/\" target=\"_blank\" rel=\"noopener\">\n      <img decoding=\"async\" src=\"https:\/\/www.chinasmartbuy.com\/blog\/wp-content\/uploads\/2026\/07\/redmi-testa-uno-smartphone-con-snapdragon-8e6-a-2-nm-4602f60e-22f5-4b48-8e96-2302-ot1es911l8.webp\" alt=\"REDMI testa uno smartphone con Snapdragon 8E6 a 2 nm: arrivo atteso nel 2027\" loading=\"lazy\">\n      <div class=\"fbp5-related-body\">\n        <span>Qualcomm<\/span>\n        <strong>REDMI testa uno smartphone con Snapdragon 8E6 a 2 nm: arrivo atteso nel 2027<\/strong>\n        <small>Un futuro REDMI di fascia alta sarebbe in test con Snapdragon 8E6 a 2 nm e debutto previsto nella prima met\u00e0 del 2027.<\/small>\n      <\/div>\n    <\/a><a class=\"fbp5-related-card\" href=\"https:\/\/www.chinasmartbuy.com\/blog\/smartphone-7-pollici-pieghevoli-huawei-xiaomi-oppo-vivo\/\" target=\"_blank\" rel=\"noopener\">\n      <img decoding=\"async\" src=\"https:\/\/www.chinasmartbuy.com\/blog\/wp-content\/uploads\/2026\/07\/huawei-071bbe67-603d-4d99-a76b-7330-1rel68m1sy.png\" alt=\"Huawei, Xiaomi, OPPO, vivo e Honor preparano smartphone da 7 pollici e nuovi pieghevoli\" loading=\"lazy\">\n      <div class=\"fbp5-related-body\">\n        <span>huawei<\/span>\n        <strong>Huawei, Xiaomi, OPPO, vivo e Honor preparano smartphone da 7 pollici e nuovi pieghevoli<\/strong>\n        <small>I principali brand cinesi stanno preparando smartphone da 7 pollici, pieghevoli larghi e nuovi flagship con batteri&#8230;<\/small>\n      <\/div>\n    <\/a><\/div>\n    <\/section><div class=\"rh-attribution-pills\" style=\"display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-start;margin:16px 0 0\"><a href=\"https:\/\/www.ithome.com\/0\/972\/861.htm\" target=\"_blank\" rel=\"noopener\" title=\"Via: VIA\" aria-label=\"Via: VIA\" style=\"display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border-radius:16px;background:linear-gradient(135deg,#fff7ed,#ffedd5);color:#c2410c;text-decoration:none;font-size:11px;font-weight:900;letter-spacing:.08em;text-transform:uppercase;border:1px solid rgba(249,115,22,.20);box-shadow:0 8px 22px rgba(249,115,22,.08)\">Via<\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Bad Epoll \u00e8 una nuova falla ad alto rischio del kernel Linux: colpisce le versioni 6. 4 e successive, coinvolge anche Android e richiede un aggiornamento del kernel.<\/p>\n","protected":false},"author":15,"featured_media":36185,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_yoast_wpseo_focuskw_text_input":"Bad Epoll Linux","footnotes":""},"categories":[480],"tags":[83,44],"class_list":["post-36186","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-amazon","tag-smartphone"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Linux, falla Bad Epoll ad alto rischio: colpiti kernel 6.4+ e Android<\/title>\n<meta name=\"description\" content=\"Bad Epoll \u00e8 una nuova vulnerabilit\u00e0 del kernel Linux con CVSS 7. 8: colpisce le versioni 6.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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