CVE-2026-90043
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 2e8ff2f51dde73a26b94aed2df4827177bd25e6e < 052b6b2d5fe97547bd2cdb73fa894f6cfea68b11 | affected |
| Linux | Linux | 2e8ff2f51dde73a26b94aed2df4827177bd25e6e < a8b5875741d416703e19ad8eeac6fce8a12bd6e4 | affected |
| Linux | Linux | 7.0 | affected |
| Linux | Linux | 0 < 7.0 | unaffected |
| Linux | Linux | 7.2.5 <= 7.2.* | unaffected |
| Linux | Linux | 7.3-rc1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/052b6b2d5fe97547bd2cdb73fa894f6cfea68b11
- https://git.kernel.org/stable/c/a8b5875741d416703e19ad8eeac6fce8a12bd6e4
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