CentOS Linux 8.4 主機已安裝的套件會受到 TuxCare CENTOS8.4：CLSA-2024：1707478061 公告中提及的多個弱點影響。

  - 已解決 Linux 核心中的下列弱點：RDMA/cma: Ensure rdma_addr_cancel() happens before issuing more requests The FSM can run in a circle allowing rdma_resolve_ip() to be called twice on the same id_priv. While this cannot happen without going through the work, it violates the invariant that the same address resolution background request cannot be active twice. CPU 1 CPU 2 rdma_resolve_addr(): RDMA_CM_IDLE -> RDMA_CM_ADDR_QUERY rdma_resolve_ip(addr_handler) #1 process_one_req(): for #1 addr_handler(): RDMA_CM_ADDR_QUERY -> RDMA_CM_ADDR_BOUND mutex_unlock(&id_priv->handler_mutex); [.. handler still running ..] rdma_resolve_addr():
    RDMA_CM_ADDR_BOUND -> RDMA_CM_ADDR_QUERY rdma_resolve_ip(addr_handler) !! two requests are now on the req_list rdma_destroy_id(): destroy_id_handler_unlock(): _destroy_id(): cma_cancel_operation():
    rdma_addr_cancel() // process_one_req() self removes it spin_lock_bh(&lock);
    cancel_delayed_work(&req->work); if (!list_empty(&req->list)) == true ! rdma_addr_cancel() returns after process_on_req #1 is done kfree(id_priv) process_one_req(): for #2 addr_handler():
    mutex_lock(&id_priv->handler_mutex); !! Use after free on id_priv rdma_addr_cancel() expects there to be one req on the list and only cancels the first one. The self-removal behavior of the work only happens after the handler has returned. This yields a situations where the req_list can have two reqs for the same handle but rdma_addr_cancel() only cancels the first one. The second req remains active beyond rdma_destroy_id() and will use-after-free id_priv once it inevitably triggers. Fix this by remembering if the id_priv has called rdma_resolve_ip() and always cancel before calling it again. This ensures the req_list never gets more than one item in it and doesn't cost anything in the normal flow that never uses this strange error path. (CVE-2021-47391)

  - 已解決 Linux 核心中的下列弱點：writeback: avoid use-after-free after removing device When a disk is removed, bdi_unregister gets called to stop further writeback and wait for associated delayed work to complete. However, wb_inode_writeback_end() may schedule bandwidth estimation dwork after this has completed, which can result in the timer attempting to access the just freed bdi_writeback. Fix this by checking if the bdi_writeback is alive, similar to when scheduling writeback work. Since this requires wb->work_lock, and wb_inode_writeback_end() may get called from interrupt, switch wb->work_lock to an irqsafe lock. (CVE-2022-49995)

  - 在 6.4.12 之前的 Linux 核心中，drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c 的 amdgpu_cs_wait_all_fences 中存在隔離釋放後使用問題。(CVE-2023-51042)

  - 在 6.4.5 之前的 Linux 核心中，drivers/gpu/drm/drm_atomic.c 在非封鎖 Atomic commit 和驅動程式卸載之間發生爭用情形時，會出現釋放後使用情形。(CVE-2023-51043)

  - 在 6.6.8 之前的 Linux 核心中發現一個問題。由於 vcc_recvmsg 爭用情形，net/atm/ioctl.c 中的 do_vcc_ioctl 有釋放後使用情形弱點。(CVE-2023-51780)

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

偵測

CentOS Linux 8.4 [TuxCare] 安全性更新：bpftool / kernel / kernel-core / kernel-cross-headers / etc 多個弱點（CENTOS8.4：CLSA-2024：1707478061）

high Nessus Plugin ID 366965

版本 1.2

偵測

CentOS Linux 8.4 [TuxCare] 安全性更新：bpftool / kernel / kernel-core / kernel-cross-headers / etc 多個弱點 （CENTOS8.4：CLSA-2024：1707478061）

high Nessus Plugin ID 366965

版本 1.2

CentOS Linux 8.4 [TuxCare] 安全性更新：bpftool / kernel / kernel-core / kernel-cross-headers / etc 多個弱點（CENTOS8.4：CLSA-2024：1707478061）