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CVE-2026-80793: 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: ipv4: reject undersized MTUs in ip_do_fragment() ip_do_fragment() subtracts the IPv4 header length from the effective MTU and passes the resulting payload MTU to ip_frag_next(). If the effective MTU is smaller than hlen + 8, ip_frag_next() rounds the fragment payload length down to zero. The fragmentation state then never makes forward progress: state->left, state->ptr and state->offset stay unchanged while ip_do_fragment() keeps allocating and transmitting header-only fragments until the softlockup detector fires. This is reproducible with a route installed using "mtu lock 20", but it is also reproducible without route MTU lock, for example by forwarding a packet to a device whose MTU is 20. Fix it in ip_do_fragment() by rejecting mtu < hlen + 8 with -EMSGSIZE, matching the existing IPv6 fragmentation check.

    Засегнати продукти

    • Linux Linux: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди a716a64a4ba68cd46f2745fba2b1099fe8e0aa59; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 515b6816ba0c12d8415c88e5f41e6ec029e35cfa; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 74ce7389f8f562d39015f59a00ef7ad6acd37803; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди b0ea911453ce7210e8200a07a94d2458bd1e6430; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 36e0741833bd823866f8cb9f112f37cea1a70b60; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди d9d1a676b033acabf8e5645f730486d1f8204a3f; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди 3556beb8ca86677af2aca5bfbed6f8e790fccc83; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди c8a74adccaf028223054633b532593101dfcc581; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 преди c0726f0caf8c6b3208552949e17d23634a2f3129
    • Linux Linux: 2.6.12; преди 2.6.12; 5.10.267 до 5.10.*; 5.15.218 до 5.15.*; 6.1.185 до 6.1.*; 6.6.154 до 6.6.*; 6.12.106 до 6.12.*; 6.18.47 до 6.18.*; 7.1.11 до 7.1.*; 7.2.1 до 7.2.*; от 7.3 нататък

    История

    • 4 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-80793: Linux | freedomonline.bg