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CVE-2026-93830: Linux

7.5

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 по мрежата, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net: stmmac: xgmac2: disable RBUE in default RX interrupt mask Enabling the RX Buffer Unavailable (RBUE) interrupt is counterproductive and can trigger a MAC interrupt storm under heavy RX pressure. When the DMA runs out of RX descriptors it fires RBUE continuously until software refills the ring. However, RBUE is redundant: the normal RX completion interrupt (RIE) already triggers NAPI, which processes completed descriptors and refills the ring, causing the DMA to resume. The RBUE handler itself only sets handle_rx - the same outcome as RIE. On Agilex5 under heavy RX pressure, the MAC interrupt (which includes RBUE) was observed firing 1,821,811,555 times against only 2,618,627 actual RX completions - a ~695x ratio - confirming the severity of the storm. RBUE does not provide OOM recovery. If page_pool is exhausted, stmmac_rx_refill() cannot advance the DMA tail pointer, the DMA stays suspended, and RBUE fires again on the next NAPI completion - a storm with no forward progress. This patch trades that storm for a clean stall with the same RX outcome. Proper OOM recovery is a pre-existing gap outside the scope of this fix. Note: as a consequence of disabling RBUE, the rx_buf_unav_irq ethtool counter will always read 0 on XGMAC2 devices. This behaviour is already inconsistent across DWMAC core versions. Remove RBUE from XGMAC_DMA_INT_DEFAULT_EN and XGMAC_DMA_INT_DEFAULT_RX to prevent the interrupt storm while keeping normal RX handling intact.

    Засегнати продукти

    • Linux Linux: d6ddfacd95c79d43465d4a85dffb1c9beca343a9 преди 8c9d57b5dc098b84631d0b3559c84c499ea2170a; d6ddfacd95c79d43465d4a85dffb1c9beca343a9 преди 7a10e54e42a8f73a8d731f5a281fc06bb41b9250; d6ddfacd95c79d43465d4a85dffb1c9beca343a9 преди 6b3b91433d5f4eae6865cdaa96f40cd67849e1f6; d6ddfacd95c79d43465d4a85dffb1c9beca343a9 преди 74dbb85a6a254b5fc1f265a6cd61b2ba9d9221d7; d6ddfacd95c79d43465d4a85dffb1c9beca343a9 преди 0b1a5d3647ce07c27a9fffefc11a8cbf7d7b25ce; d6ddfacd95c79d43465d4a85dffb1c9beca343a9 преди 87e2826ed2058747ddf014c082569a46bfadd96b; d6ddfacd95c79d43465d4a85dffb1c9beca343a9 преди d3265c19b35d036bba327b36b5366bee76b0157c
    • Linux Linux: 4.19; преди 4.19; 5.10.271 до 5.10.*; 5.15.222 до 5.15.*; 6.1.189 до 6.1.*; 6.6.158 до 6.6.*; 6.12.111 до 6.12.*; 6.18.53 до 6.18.*; от 7.2 нататък

    История

    • 24 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-93830: Linux | freedomonline.bg