kernel: bpf: Fix pointer-leak due to insufficient speculative store bypass mitigation

A vulnerability was found in the Linux kernel's eBPF verifier function checkstackwrite, where pointer leakage can occur due to insufficient speculative store bypass mitigation. This issue occurs because the original mitigation inserts lfence instructions after initializing a stack slot and spilli...

OESA-2021-1324 kernel security update

The Linux Kernel, the operating system core itself. Security Fixes: In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of...