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CVE-2026-23255: Linux

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CVSS

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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: net: add proper RCU protection to /proc/net/ptype Yin Fengwei reported an RCU stall in ptype_seq_show() and provided a patch. Real issue is that ptype_seq_next() and ptype_seq_show() violate RCU rules. ptype_seq_show() runs under rcu_read_lock(), and reads pt->dev to get device name without any barrier. At the same time, concurrent writers can remove a packet_type structure (which is correctly freed after an RCU grace period) and clear pt->dev without an RCU grace period. Define ptype_iter_state to carry a dev pointer along seq_net_private: struct ptype_iter_state { struct seq_net_private p; struct net_device *dev; // added in this patch }; We need to record the device pointer in ptype_get_idx() and ptype_seq_next() so that ptype_seq_show() is safe against concurrent pt->dev changes. We also need to add full RCU protection in ptype_seq_next(). (Missing READ_ONCE() when reading list.next values) Many thanks to Dong Chenchen for providing a repro.

    Засегнати продукти

    • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди e974a10a52618f7f57a4bce173a0ed96acd4e5dc; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 002a73470b56848e4c81efeaaedd471e92d66d8d; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди dcefd3f0b9ed8288654c75254bdcee8e1085e861; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 589a530ae44d0c80f523fcfd1a15af8087f27d35; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди f613e8b4afea0cd17c7168e8b00e25bc8d33175d
    • Linux Linux: 2.6.12; преди 2.6.12; 6.1.175 до 6.1.*; 6.6.136 до 6.6.*; 6.12.80 до 6.12.*; 6.18.10 до 6.18.*; от 6.19 нататък
    • Siemens: още 4 продукта, добавени от Siemens

      SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIMATIC S7-1500 TM MFP - GNU/Linux subsystem, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

    История

    • 18 март 2026 Публикувано

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    Първоизточници

    CVE-2026-23255: Linux | freedomonline.bg