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CVE-2026-81003: Linux

8.1

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се от съседна мрежа, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net/iucv: filter frames in afiucv_hs_rcv() by ingress device afiucv_hs_rcv() selects a socket from iucv_sk_list by matching four 8-byte name fields in the transport header alone. No check is made against the net_device the frame arrived on. This can cause a frame arriving on any netdev to be delivered to an AF_IUCV socket. Three problems follow. First, a frame arriving over HiperSockets can be delivered to a socket bound to the classic z/VM IUCV transport, which has iucv->hs_dev == NULL. iucv_sock_bind() takes the classic path whenever the requested userid matches iucv_userid, even on a guest that also has a HiperSockets device carrying the same identifier. The child socket created by afiucv_hs_callback_syn() for such a match inherits hs_dev = NULL and transport = AF_IUCV_TRANS_HIPER, so the first send() on it returns -ENODEV. The socket delivered to accept() is unusable. Second, a frame arriving on one netdev can be delivered to a socket bound to a different IQD device. Which can lead to - Accept-queue exhaustion (DoS) - Attacker-controlled peer identity in the child socket - Data injection into existing sockets - Fabric noise on the IQD fabric, where bogus replies are sent - killing established connections Third, all AF_IUCV sockets live in init_net, as iucv_sock_alloc() calls sk_alloc(&init_net, ...). But even frames arriving on netdev devices in a namespace can be delivered to an IUCV socket. So a process in an unprivileged user and network namespace holding only the CAP_NET_RAW capability valid within that namespace can send a raw ETH_P_AF_IUCV frame on its own lo device and have it matched against init_net sockets. Fix all three by skipping any socket whose hs_dev does not match the ingress device. A classic z/VM IUCV socket has hs_dev == NULL; the ingress dev is never NULL, so classic sockets are skipped automatically. An unbound HIPER socket also has hs_dev == NULL and is skipped. A b

    Засегнати продукти

    • Linux Linux: 3881ac441f642d56503818123446f7298442236b преди 639828ad4d374056167391dbaffd13dd5e5e5ddb; 3881ac441f642d56503818123446f7298442236b преди 92e5c281f1caa287bb58292f2687c9e3ff3aa23e; 3881ac441f642d56503818123446f7298442236b преди 712330f8a4293cfd97b0d62b7c7dc01862a16b98; 3881ac441f642d56503818123446f7298442236b преди 0a5af67e7184c6a0e155c317840bd64b37177af4; 3881ac441f642d56503818123446f7298442236b преди dfac2936b83be00035ae176f8252e1c1e1de9207; 3881ac441f642d56503818123446f7298442236b преди 8e3763f1ccac3fc395f9af2b87114c023ced8a3f; 3881ac441f642d56503818123446f7298442236b преди a7f0130a091724e69827ab58e74777a88747e892; 3881ac441f642d56503818123446f7298442236b преди 80230a18c164a4b5bbc048fe2768b219ac17bc5a
    • Linux Linux: 3.2; преди 3.2; 5.10.270 до 5.10.*; 5.15.221 до 5.15.*; 6.1.188 до 6.1.*; 6.6.157 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

    История

    • 11 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-81003: Linux | freedomonline.bg