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CVE-2026-80847: 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: tcp: clamp route advmss to TCP_MIN_MSS tcp_select_initial_window() assumes that callers never pass an MSS smaller than 1, but route-derived advmss values can violate that assumption. A too-small explicit RTAX_ADVMSS is one way to get there, but it is not the only one. The same divide-by-zero can also be reached through the "default advmss" path when RTAX_ADVMSS is left at 0 and the effective advmss is later driven down by route MTU and min_adv_mss. Introduce a tcp_dst_advmss() helper that clamps route advmss to TCP_MIN_MSS before TCP consumes it, and use it in the TCP paths that derive advmss from dst metrics. This keeps the effective MSS from dropping to zero before tcp_select_initial_window() rounds the receive window.

    Засегнати продукти

    • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 1aedef9ca04aad427a077c7c427ffd89768038bc; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 788fbbf7d61f9742298417c207c91b6db159fbbc; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди eaf4af9bd6975c2eff8d48820937c83032d968dc; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди cfb44c6028e6f979720315e0772bbd0d4d33ed61; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 6b8c20bf61924dfc38fefb145c9f7406d73fae53; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 31cf2349361902769dc323e4dbf4b449795ec288; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 870a9e42ecc6fe1b8c25d87af043cb0d9c178fe1
    • Linux Linux: 2.6.12; преди 2.6.12; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.111 до 6.12.*; 6.18.51 до 6.18.*; 7.1.13 до 7.1.*; 7.2.3 до 7.2.*; 7.3 до *

    История

    • 4 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-80847: Linux | freedomonline.bg