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CVE-2026-89718: Linux

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: zram: fix out-of-bounds access in writeback_store() Patch series "zram: fix stale scan bounds after reinitialization". Both writeback_store() and read_block_state() derive their table scan bounds from zram->disksize before acquiring dev_lock. If the device is reset and reinitialized with a smaller disksize between that read and lock acquisition, the bound can describe the old table while the scan operates on the new one. This can lead to out-of-bounds slot accesses. Move both bound calculations under dev_lock so each bound remains consistent with the table throughout its scan. Keep the fixes separate because the affected interfaces originate from different commits and can be backported independently. This patch (of 2): writeback_store() calculates the table scan bounds before taking dev_lock. A reset followed by reconfiguration with a smaller disksize can therefore replace zram->table while writeback_store() is waiting for the lock. Once it acquires the lock, it sees an initialized device but scans the new table using the old upper bound, resulting in an out-of-bounds access. Calculate the number of pages while holding dev_lock so the scan bound matches the table protected by the lock.

    Засегнати продукти

    • Linux Linux: a939888ec38bf1f33e4a903056677e92a4844244 преди f1c5611f699a3aa2a85ebd5fec03dc9bc501e6d0; a939888ec38bf1f33e4a903056677e92a4844244 преди c2745e657f0974871fbc60d46d48c2b04e581330; a939888ec38bf1f33e4a903056677e92a4844244 преди 4d82d60178b02797dbe529e01ac211b26670c49f; a939888ec38bf1f33e4a903056677e92a4844244 преди ef073edd7cfd31aeb90eeab23273102c601f4d8e; a939888ec38bf1f33e4a903056677e92a4844244 преди 07a82a66f8c1894d92e51d97542c32ebf2c51b09; a939888ec38bf1f33e4a903056677e92a4844244 преди 894913e2d35c46ff19a77530907771ae57862b96
    • Linux Linux: 5.0; преди 5.0; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.111 до 6.12.*; 6.18.57 до 6.18.*; 7.2.4 до 7.2.*; 7.3 до *

    История

    • 11 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89718: Linux | freedomonline.bg