MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure

Summary MessagePack::Bufferclear shifts out every chunk and returns its 4 KiB rmem page to the shared pool, but does not reset the buffer's rmem cursor rmemlast, rmemend, rmemowner. The next write sees "unused rmem space" left over from the freed page and hands back a slice of memory that has...

CVE-2025-8860

A flaw was found in QEMU in the uefi-vars virtual device. When the guest writes to register UEFIVARSREGBUFFERSIZE, the .write callback uefivarswrite is invoked. The function allocates a heap buffer without zeroing the memory, leaving the buffer filled with residual data from prior allocations. Wh...

hw: cpu: speculative store bypass

An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions a commonly used performance optimization. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the...

hw: cpu: speculative store bypass

An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions a commonly used performance optimization. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the...