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CVE-2026-90184: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: null_blk: serialize configfs attribute updates with device setup The attribute store methods generated with NULLB_DEVICE_ATTR() refuse to change the configuration of a live device by testing NULLB_DEV_FL_CONFIGURED, but that flag is only set by nullb_device_power_store() after null_add_dev() has returned, and the store methods take no lock at all. configfs only serializes writes to the same open file (buffer->mutex), so a write to any attribute can run concurrently with null_add_dev() and change the device configuration while it is being used. null_add_dev() reads the configuration several times, e.g. dev->zoned is read once to set up the queue limits and once to initialize the zone resources: CPU0: echo 1 > nullb0/power CPU1: echo 1 > nullb0/zoned nullb_device_power_store() mutex_lock(&lock) null_add_dev() if (dev->zoned) -> false /* no BLK_FEAT_ZONED */ nullb_device_zoned_store() test_bit(FL_CONFIGURED) -> 0 dev->zoned = true blk_mq_alloc_disk() /* queue is not zoned */ if (nullb->dev->zoned) -> true null_register_zoned_dev() blk_revalidate_disk_zones() blk_revalidate_disk_zones() is then called for a queue that does not have BLK_FEAT_ZONED set, which triggers its WARN_ON_ONCE() and fails the device setup with -EIO: WARNING: CPU: 2 PID: 322 at block/blk-zoned.c:2357 blk_revalidate_disk_zones+0x4c/0x560 Clearing dev->zoned in the same window is worse: the queue is created with BLK_FEAT_ZONED but the zone resources are never initialized, so add_disk() succeeds for a zoned disk that has no zones. And a store that lands after the last dev->zoned test leaves dev->zoned set while dev->zones is still NULL, which null_process_zoned_cmd() dereferences on the first write. Fix this by taking the global lock, which nullb_device_power_store() al

    Засегнати продукти

    • Linux Linux: 3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa преди 6352e7ead2d8111802a554eeb94886f5a9894bb9; 3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa преди 7de792b4c48fba02a36a8077032f7d5093c925e5; 3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa преди aed8af338a09a64d63b068a803c4ecfc5701dd4c; 3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa преди 32456a85995579e56c60cc53c357cda75a9d4f7c; 3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa преди d3d35dd045a35991bf6fd13de5f293e6dd7bf3b3; 3bf2bd20734e3e6ffda53719a9c10fb3ee9c5ffa преди 4e1f23f9c33c156be7e313b40695af5a3a834739
    • Linux Linux: 4.14; преди 4.14; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.52 до 6.18.*; 7.2.6 до 7.2.*; от 7.3 нататък

    История

    • 17 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-90184: Linux | freedomonline.bg