Patchlage

CVE-2026-90043

CVE CVE-2026-90043EUVD EUVD-2026-80651Published 2026-09-16T10:33:40.000ZLast changed 2026-09-16T14:41:56.000ZCVSS 7.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

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Carried in the product catalogue

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