CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's zram module, specifically in how the slot lock bit is positioned on big-endian 64-bit architectures. This misalignment can allow multiple CPUs to erroneously access the same slot, potentially leading to data corruption or system instability. Organizations using Linux on big-endian 64-bit systems should prioritize applying the fix to ensure the integrity and reliability of their zram functionality.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: zram: fix slot lock bit position on big-endian 64-bit The slot lock is a bit operation on the whole __lock word, which flags and ac_time alias as two u32s. On little-endian the lock bit lands in the position ZRAM_ENTRY_LOCK reserves in flags, so the aliasing works out. On 64-bit big-endian it lands in ac_time instead: with ZRAM_TRACK_ENTRY_ACTIME enabled, storing the access time from mark_slot_accessed() or slot_free() wipes out the held lock bit, letting another CPU take the same slot lock; an access time value with that bit set makes the slot look locked forever. Shift the lock bit into the flags half of the word on big-endian 64-bit.