CVE-2025-21647

In the Linux kernel, the following vulnerability has been resolved: sched: schcake: add bounds checks to host bulk flow fairness counts Even though we fixed a logic error in the commit cited below, syzbot still managed to trigger an underflow of the per-host bulk flow counters, leading to an out ...

CVE-2025-21647

The CVE-2025-21647 vulnerability affects the Linux kernel’s sched: sch_cake path, where an underflow in per-host bulk flow counters could cause out-of-bounds memory access. A fix adds bounds-checking around all accesses to per-host bulk flow counters via helper functions, moving flow mode checks ...