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CVE-2026-90072: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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Време до експлоатация

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net/sched: sfq: clamp quantum to avoid signed overflow soft lockup sfq_init() sets q->quantum = psched_mtu(qdisc_dev(sch)) (unsigned). A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes psched_mtu() return 0x80000000, so slot->allot = INT_MIN and INT_MIN + INT_MIN toggles between INT_MIN and 0 forever, spinning sfq_dequeue() under the qdisc lock. Clamp the quantum to [256, 1 << 20] so the refill loop terminates. The lower bound also covers q->quantum == 0 (psched_mtu() returning 0), which spins sfq_dequeue() identically. sfq_change() already rejects a negative quantum, so only the init path was exposed. Conditions to recreate the bug: a device whose MTU (plus hard_header_len) wraps psched_mtu() into the sign bit (e.g. a dummy device with max_mtu == 0 accepting MTU 2147483634). Requires CAP_NET_ADMIN in a user namespace.

    Засегнати продукти

    • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 86799499585af06a9431c9e7782658667bd62650; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 2017c355a5a1af77736cd1739fe922f69b5652dc; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 6581a82bf08ba5d4e2a6d4e3080df43315b296c4; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 9d782c662879c3adaaca30e05c36910ad11b9e54; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди d72dbdfaeb5b9b8d884e0e036c3442754379ef74; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди aeb8196ecb95146e3410f635628e6cd47352b3e5; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди da16c31517cd2c06bb2c78c73e91ae192c01c426; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 816e90057ab1879562a5b7cc688e35bb9027ae97
    • Linux Linux: 2.6.12; преди 2.6.12; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.110 до 6.12.*; 6.18.52 до 6.18.*; 7.2.6 до 7.2.*; от 7.3 нататък

    История

    • 17 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-90072: Linux | freedomonline.bg