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CVE-2026-23393: Linux

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: bridge: cfm: Fix race condition in peer_mep deletion When a peer MEP is being deleted, cancel_delayed_work_sync() is called on ccm_rx_dwork before freeing. However, br_cfm_frame_rx() runs in softirq context under rcu_read_lock (without RTNL) and can re-schedule ccm_rx_dwork via ccm_rx_timer_start() between cancel_delayed_work_sync() returning and kfree_rcu() being called. The following is a simple race scenario: cpu0 cpu1 mep_delete_implementation() cancel_delayed_work_sync(ccm_rx_dwork); br_cfm_frame_rx() // peer_mep still in hlist if (peer_mep->ccm_defect) ccm_rx_timer_start() queue_delayed_work(ccm_rx_dwork) hlist_del_rcu(&peer_mep->head); kfree_rcu(peer_mep, rcu); ccm_rx_work_expired() // on freed peer_mep To prevent this, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync() in both peer MEP deletion paths, so that subsequent queue_delayed_work() calls from br_cfm_frame_rx() are silently rejected. The cc_peer_disable() helper retains cancel_delayed_work_sync() because it is also used for the CC enable/disable toggle path where the work must remain re-schedulable.

    Засегнати продукти

    • Linux Linux: dc32cbb3dbd7da38c700d6e0fc6354df24920525 преди e89dbd2736a45f0507949af4748cbbf3ff793146; dc32cbb3dbd7da38c700d6e0fc6354df24920525 преди d8f35767bacb3c7769d470a41cf161e3f3c07e70; dc32cbb3dbd7da38c700d6e0fc6354df24920525 преди 1fd81151f65927fd9edb8ecd12ad45527dbbe5ab; dc32cbb3dbd7da38c700d6e0fc6354df24920525 преди 3715a00855316066cdda69d43648336367422127
    • Linux Linux: 5.11; преди 5.11; 6.12.78 до 6.12.*; 6.18.20 до 6.18.*; 6.19.10 до 6.19.*; от 7.0 нататък

    История

    • 25 март 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-23393: Linux | freedomonline.bg