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CVE-2026-99201: 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: netlink: avoid hashing the network namespace pointer The netlink rhashtable key includes a raw struct net pointer and a user-controlled port ID. Both /proc/net/netlink and socket diagnostics expose the table's bucket order. By binding and rebinding chosen NETLINK_USERSOCK port IDs, an unprivileged reader can distinguish equal buckets and recover the low bits of the Jenkins hash. Its 32-bit seed and the limited set of kernel-image slides can then be searched offline to recover the address of init_net. Use the namespace's unique, non-address net_cookie in the comparison key instead. It is assigned before the per-net initializers run and remains unchanged for the namespace's lifetime. The lookup key and object hash are still built by netlink_compare_arg_init(), keeping lookup, insertion, removal and rehashing consistent while preserving namespace separation. Neither public table walker needs to change. Reading the socket's namespace cookie in netlink_compare() is safe under RCU, including during namespace teardown. netlink_release() removes the socket from the hash table and defers its final put with call_rcu(). cleanup_net() runs the per-net exit methods and waits for outstanding RCU callbacks with rcu_barrier() before freeing namespace storage. Unlike ns.ns_id, net_cookie is also available and initialized during setup_net() in older stable kernels, making the change straightforward to backport to v5.15 and later.

    Засегнати продукти

    • Linux Linux: c428ecd1a21f1457ca3beb4df71b8a079c410e41 преди c61431f3b8c9824e9848a0308054f92b27fa7794; c428ecd1a21f1457ca3beb4df71b8a079c410e41 преди f8d2690f3c5dfad1fc306f6d5d84a1d3176c3af9; c428ecd1a21f1457ca3beb4df71b8a079c410e41 преди c03fb9c4be3b2dd0996d91e54f65407f7f475238; c428ecd1a21f1457ca3beb4df71b8a079c410e41 преди 41a2f69f091b0765f17890d8ac04852c12f25cf6; c428ecd1a21f1457ca3beb4df71b8a079c410e41 преди 18edcb9945118beb7a1b64a31a7370ecab485a79; c428ecd1a21f1457ca3beb4df71b8a079c410e41 преди bdd55b8a8acbf6b4840ab420eb6a63774bf4593b; c428ecd1a21f1457ca3beb4df71b8a079c410e41 преди 078deff25f8a849ecd1c3fe17b1e473b1cf44f28; c428ecd1a21f1457ca3beb4df71b8a079c410e41 преди f88bb3606e4bd11ee035b682cddc2999e604609a
    • Linux Linux: 4.1; преди 4.1; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.161 до 6.6.*; 6.12.115 до 6.12.*; 6.18.59 до 6.18.*; 7.2.13 до 7.2.*; от 7.3 нататък

    История

    • 28 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-99201: Linux | freedomonline.bg