A newly disclosed Linux kernel flaw dubbed "Copy Fail" can let a local, unprivileged attacker gain root access on major Linux distributions, with researchers claiming the bug affects kernels shipped since 2017. "The POC exploit works out of the box today, but a future version that can escape from containers like Docker is promised soon," writes Slashdot reader tylerni7. "Technical details are available here." Slashdot reader BrianFagioli shares a report from NERDS.xyz: A newly disclosed Linux kernel vulnerability called Copy Fail (CVE-2026-31431) allows an unprivileged user to gain root access using a tiny 732-byte script, and it works with unsettling consistency across major distributions. Unlike older exploits that relied on race conditions or fragile timing, this one is a straight-line logic flaw in the kernel's crypto subsystem. It abuses AF_ALG sockets and splice to overwrite a few bytes in the page cache of a target file, such as /usr/bin/su. Because the kernel executes from the page cache, not directly from disk, the attacker can inject code into a setuid binary in memory and immediately escalate privileges. What makes this especially concerning is how quiet it is. The file on disk remains unchanged, so standard integrity checks see nothing wrong, while the in-memory version has already been tampered with. The same primitive can also cross container boundaries since the page cache is shared, raising the stakes for multi-tenant environments and Kubernetes nodes. The underlying issue traces back to an in-place optimization added years ago, now being rolled back as part of the fix. Until patched kernels are widely deployed, this is one of those bugs that feels less like a theoretical risk and more like a practical, reliable path to full system compromise.

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French prosecutors say police detained a 15-year-old suspected of using the alias "breach3d" in connection with a cyberattack on France Titres (ANTS), the state agency that handles passports, ID cards, and other secure documents. The breach allegedly involved 12 million to 18 million lines of data offered for sale online, potentially affecting up to a third of France's population if the records are unique. The Register reports: It formally opened (PDF) a judicial investigation on April 29, covering alleged fraudulent access to a state-run automated data processing system and the extraction of data from it. Each offense carries a potential prison sentence of seven years and a maximum ~$350,000 fine. Public Prosecutor Laure Beccuau has requested that the minor, whose pronouns, like their name, were also not specified, be formally charged and placed under judicial supervision. [...] France's approach to punishing minors via its legal system is typically geared toward re-education and rehabilitation rather than prison time. While those aged between 13 and 16 can face time in juvenile detention, it is often used as a last resort measure. The maximum sentences and fines for the charges the 15-year-old in this case faces are upper limits imposed on adult offenders, and would likely be lowered substantially in cases involving a minor, like this one.

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