CVE-2026-90043

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.