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CVE-2026-45840: 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: openvswitch: cap upcall PID array size and pre-size vport replies The vport netlink reply helpers allocate a fixed-size skb with nlmsg_new(NLMSG_DEFAULT_SIZE, ...) but serialize the full upcall PID array via ovs_vport_get_upcall_portids(). Since ovs_vport_set_upcall_portids() accepts any non-zero multiple of sizeof(u32) with no upper bound, a CAP_NET_ADMIN user can install a PID array large enough to overflow the reply buffer, causing nla_put() to fail with -EMSGSIZE and hitting BUG_ON(err < 0). On systems with unprivileged user namespaces enabled (e.g., Ubuntu default), this is reachable via unshare -Urn since OVS vport mutation operations use GENL_UNS_ADMIN_PERM. kernel BUG at net/openvswitch/datapath.c:2414! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 1 UID: 0 PID: 65 Comm: poc Not tainted 7.0.0-rc7-00195-geb216e422044 #1 RIP: 0010:ovs_vport_cmd_set+0x34c/0x400 Call Trace: <TASK> genl_family_rcv_msg_doit (net/netlink/genetlink.c:1116) genl_rcv_msg (net/netlink/genetlink.c:1194) netlink_rcv_skb (net/netlink/af_netlink.c:2550) genl_rcv (net/netlink/genetlink.c:1219) netlink_unicast (net/netlink/af_netlink.c:1344) netlink_sendmsg (net/netlink/af_netlink.c:1894) __sys_sendto (net/socket.c:2206) __x64_sys_sendto (net/socket.c:2209) do_syscall_64 (arch/x86/entry/syscall_64.c:63) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) </TASK> Kernel panic - not syncing: Fatal exception Reject attempts to set more PIDs than nr_cpu_ids in ovs_vport_set_upcall_portids(), and pre-compute the worst-case reply size in ovs_vport_cmd_msg_size() based on that bound, similar to the existing ovs_dp_cmd_msg_size(). nr_cpu_ids matches the cap already used by the per-CPU dispatch configuration on the datapath side (ovs_dp_cmd_fill_info() serialises at most nr_cpu_ids PIDs), so the two sides stay consistent.

    Засегнати продукти

    • Linux Linux: 5cd667b0a4567048bb555927d6ee564f4e5620a9 преди 8d59b80e69dddb665eb2de36e62859ab2073470e; 5cd667b0a4567048bb555927d6ee564f4e5620a9 преди d9e47e29aacb9f8a9d59feb6ab5b128a9bbb40b0; 5cd667b0a4567048bb555927d6ee564f4e5620a9 преди b39f763d720d623218bc1d95ace6855d7b474e81; 5cd667b0a4567048bb555927d6ee564f4e5620a9 преди f9ef3db77a383d66847fd082c2b437d8ae4d9c63; 5cd667b0a4567048bb555927d6ee564f4e5620a9 преди f99ac36b5d7c719d08a69fcdecce40f78a874e15; 5cd667b0a4567048bb555927d6ee564f4e5620a9 преди fa6e90bc443bed8dc0d55bc5ea5b27ffdfe37704; 5cd667b0a4567048bb555927d6ee564f4e5620a9 преди 1d6c02b86329883aa467a3a61f8d34369db73a2f; 5cd667b0a4567048bb555927d6ee564f4e5620a9 преди 2091c6aa0df6aba47deb5c8ab232b1cb60af3519
    • Linux Linux: 3.17; преди 3.17; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.141 до 6.6.*; 6.12.91 до 6.12.*; 6.18.33 до 6.18.*; 7.0.10 до 7.0.*; от 7.1 нататък
    • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem: всички версии

    История

    • 27 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-45840: Linux | freedomonline.bg