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CVE-2026-98079: 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: btrfs: zstd: fix lost wakeup when waiting for a workspace A writer can sleep forever in zstd_get_workspace() even though a workspace is free. When zstd_alloc_workspace() fails, the task is queued on zwsm->wait and schedules unconditionally, never re-testing the pool. zstd_put_workspace() publishes the workspace and then calls cond_wake_up(), which only wakes when a sleeper is already visible, so a workspace returned between the failed allocation and prepare_to_wait() wakes nobody. The window is wide: zstd_alloc_workspace() goes through kvmalloc() and may enter reclaim. Only a max level workspace triggers the wakeup and one is deliberately kept allocated as the fallback every waiter waits for, so once its wakeup is lost the writer stays in TASK_UNINTERRUPTIBLE until some other task happens to return one. Re-check the pool after prepare_to_wait() has published the waiter, and use the workspace if one turned up.

    Засегнати продукти

    • Linux Linux: 3f93aef535c8ea03e40cd8acf0753b3e6ed33e96 преди 14d982762945d9945c60bbd48b77df194dd8e28d; 3f93aef535c8ea03e40cd8acf0753b3e6ed33e96 преди 844603cf842ee67640d33f350e3fa60f3de7fad3; 3f93aef535c8ea03e40cd8acf0753b3e6ed33e96 преди d8f57049521948df5f50797141472fbbed3b0723; 3f93aef535c8ea03e40cd8acf0753b3e6ed33e96 преди 0de9f31d447ae71ab08c7850a321682f8d2907c3; 3f93aef535c8ea03e40cd8acf0753b3e6ed33e96 преди 2acb9f3d1cc8f65dc81ed55e238cbf8e5b60bff7
    • Linux Linux: 5.1; преди 5.1; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 6.18.53 до 6.18.*; 7.2.7 до 7.2.*; от 7.3 нататък

    История

    • 25 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-98079: Linux | freedomonline.bg