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CVE-2026-68296: Linux

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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: gre: fix lltx regression for GRE tunnels with SEQ/CSUM Before commit 00d066a4d4ed ("netdev_features: convert NETIF_F_LLTX to dev->lltx"), NETIF_F_LLTX was set unconditionally in both __gre_tunnel_init() and ip6gre_tnl_init_features() alongside GRE_FEATURES: dev->features |= GRE_FEATURES | NETIF_F_LLTX; When that commit converted NETIF_F_LLTX to the dev->lltx flag, it placed 'dev->lltx = true' after the SEQ/CSUM early returns instead of before them. This causes GRE/GRETAP/ip6gre tunnels with SEQ or CSUM+encap to lose lockless TX, reintroducing _xmit_lock acquisition around their ndo_start_xmit. Since GRE xmit re-enters the stack via ip_tunnel_xmit(), holding _xmit_lock risks ABBA deadlock with the underlay device. CPU0 CPU1 ---- ---- lock(&qdisc_xmit_lock_key#6); lock(&qdisc_xmit_lock_key#3); lock(&qdisc_xmit_lock_key#6); lock(&qdisc_xmit_lock_key#3); Fix by moving dev->lltx = true before the early returns in both functions, restoring the original unconditional behavior.

    Засегнати продукти

    • Linux Linux: 00d066a4d4edbe559ba6c35153da71d4b2b8a383 преди 9f948e9aede9678f4103457daf2bc9dd54c65a06; 00d066a4d4edbe559ba6c35153da71d4b2b8a383 преди 15a1c5f2ed2eeb3daad8d5766fd506aeda4710f3; 00d066a4d4edbe559ba6c35153da71d4b2b8a383 преди 2bffe379023512d280337c70faeb6a8cc435db5e; 00d066a4d4edbe559ba6c35153da71d4b2b8a383 преди 675ed582c1aa4d919dd535490de08c015005c653
    • Linux Linux: 6.12; преди 6.12; 6.12.101 до 6.12.*; 6.18.42 до 6.18.*; 7.1.6 до 7.1.*; от 7.2 нататък

    История

    • 10 август 2026 Публикувано

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    Първоизточници

    CVE-2026-68296: Linux | freedomonline.bg