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CISA warns of actively exploited 'Copy Fail' Linux kernel flaw enabling root takeover

By PulseAugur Editorial · [5 sources] ·

A critical Linux kernel vulnerability, dubbed "Copy Fail" (CVE-2026-31431), is actively being exploited, according to the U.S. Cybersecurity and Infrastructure Security Agency (CISA). The flaw allows unprivileged local users to escalate privileges to root access, affecting major distributions like Ubuntu, Amazon Linux, RHEL, and SUSE. Researchers at Theori disclosed the vulnerability and a reliable proof-of-concept exploit simultaneously, leading to rapid inclusion in CISA's Known Exploited Vulnerabilities catalog and a two-week patching directive for federal agencies. AI

IMPACT Highlights the increasing risk of AI-discovered vulnerabilities being weaponized rapidly, pressuring organizations to accelerate patching cycles.

RANK_REASON CISA flags an actively exploited vulnerability with a public exploit, prompting urgent patching directives for federal agencies.

Read on The Register — AI →

AI-generated summary · Google Gemini · from 5 sources. How we write summaries →

CISA warns of actively exploited 'Copy Fail' Linux kernel flaw enabling root takeover

COVERAGE [5]

  1. Tom's Hardware TIER_1 English(EN) · Etiido Uko ·

    CISA flags actively exploited ‘Copy Fail’ Linux kernel flaw enabling root takeover across major distros — unpatched systems may remain vulnerable to attack

    CISA warns of the actively exploited “Copy Fail” Linux flaw (CVE-2026-31431), enabling root access, with a public exploit released before patches were ready.

  2. The Register — AI TIER_1 English(EN) · Carly Page ·

    Attackers are cashing in on fresh 'CopyFail' Linux flaw

    <h4>Researchers dropped a reliable root exploit and it didn’t sit idle for long</h4> <p>CISA is warning that a newly-disclosed Linux kernel bug dubbed "CopyFail" is already being exploited, just days after researchers dropped a working root-level exploit.…</p>

  3. The Register — AI TIER_1 English(EN) ·

    Attackers are cashing in on fresh 'CopyFail' Linux flaw

    Researchers dropped a reliable root exploit and it didn’t sit idle for long

  4. Mastodon — fosstodon.org TIER_1 English(EN) · [email protected] ·

    CISA flags actively exploited ‘Copy Fail’ Linux kernel flaw enabling root takeover across major distros — unpatched systems may remain vulnerable to attack CISA

    CISA flags actively exploited ‘Copy Fail’ Linux kernel flaw enabling root takeover across major distros — unpatched systems may remain vulnerable to attack CISA warns of the actively exploited “Copy Fail” Linux flaw (CVE-2026-31431), enabling root access, with a public exploit re…

    LINKS tomshardware.com/…/cisa-flags-actively-ex…
  5. Mastodon — fosstodon.org TIER_1 English(EN) · will ·

    Copy Fail (CVE-2026-31431), disclosed Wednesday by security firm Theori, lets any local # Linux user gain root access on # Ubuntu , Amazon Linux, # RHEL , and #

    Copy Fail (CVE-2026-31431), disclosed Wednesday by security firm Theori, lets any local # Linux user gain root access on # Ubuntu , Amazon Linux, # RHEL , and # SUSE . The bug traces to a 2017 optimization in the kernel’s AEAD crypto path; an # AI powered scanner reportedly found…

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