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CVE-2026-98253: 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: RDMA/ucma: Serialize join and leave on copy_to_user failure rdma_join_multicast() queues RoCE work that later reads the ucma_multicast through event->param.ud.private_data, then list_add()s the CMA multicast at the head of id_priv->mc_list. rdma_leave_multicast() matches only by sockaddr and destroys the first hit. ucma_process_join() used to drop ctx->mutex after a successful join and retake it only if copy_to_user() failed. Two concurrent JOIN_MCAST calls with the same address can therefore insert a second CMA entry before the first thread's leave. leave then cancels the newer work and the older worker still dereferences the ucma_multicast that the first thread frees. Keep ctx->mutex held from rdma_join_multicast() through copy_to_user() and, on -EFAULT, through rdma_leave_multicast() so leave cannot miss this join. Do not leave if join itself failed: that path never published this address on mc_list, and a leave-by-addr would destroy an earlier successful join.

    Засегнати продукти

    • Linux Linux: 60d613b39e8d0c9f3b526e9c96445422b4562d76 преди 29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9; fe454dc31e84f8c14cb8942fcb61666c9f40745b преди 52172e11bd074ccaded21740ffeb67123f01dd00; fe454dc31e84f8c14cb8942fcb61666c9f40745b преди 01e29d0d78a8f66f221625720a04939eef5ec1f6; fe454dc31e84f8c14cb8942fcb61666c9f40745b преди ae805d204cf1f15b87d1bf3529b4c649f3519420; fe454dc31e84f8c14cb8942fcb61666c9f40745b преди 43c4e24bd10370fc976f6220518049ce71419399; fe454dc31e84f8c14cb8942fcb61666c9f40745b преди 01cbdb724c584d7772fd25af2e4dfdf8527ce0d5; fe454dc31e84f8c14cb8942fcb61666c9f40745b преди 83610ee5e498fa5bfcb80031d2b959baea276bf6; fe454dc31e84f8c14cb8942fcb61666c9f40745b преди 662ade4de9ff5eceb0820a9f8e9fac70ba6a815b; a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4; 5.10.20 преди 5.10.271; 5.11.3 преди 5.12
    • Linux Linux: 5.12; преди 5.12; 5.10.271 до 5.10.*; 5.15.222 до 5.15.*; 6.1.189 до 6.1.*; 6.6.158 до 6.6.*; 6.12.112 до 6.12.*; 6.18.54 до 6.18.*; 7.2.8 до 7.2.*; от 7.3 нататък

    История

    • 6 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-98253: Linux | freedomonline.bg