CVE-2026-68397 is a vulnerability in Linux Kernel
Published on August 10, 2026
net/iucv: take a reference on the socket found in afiucv_hs_rcv()
In the Linux kernel, the following vulnerability has been resolved:
net/iucv: take a reference on the socket found in afiucv_hs_rcv()
afiucv_hs_rcv() looks up the destination socket under iucv_sk_list.lock,
drops the lock, and then passes the socket to the afiucv_hs_callback_*()
handlers without holding a reference. AF_IUCV sockets are not
RCU-protected and are freed synchronously by iucv_sock_kill() ->
sock_put(), so a concurrent close can free the socket in the window
between read_unlock() and the handler, which then dereferences freed
memory (for example sk->sk_data_ready() in afiucv_hs_callback_syn()).
Take a reference with sock_hold() while the socket is still on the list
and release it with sock_put() once the handler has run.
Products Associated with CVE-2026-68397
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Affected Versions
Linux:- Version 3881ac441f642d56503818123446f7298442236b and below 4dc0e63abf8bc7ba8892e617c1fb8b204361e022 is affected.
- Version 3881ac441f642d56503818123446f7298442236b and below 1801cb20a5025a787d6853e19c38db138344b4b4 is affected.
- Version 3881ac441f642d56503818123446f7298442236b and below c75a950e77356e526672cba4584080c6c8b793b6 is affected.
- Version 3881ac441f642d56503818123446f7298442236b and below 5595ea59cdf29182cf6a270cacc1426c57b603de is affected.
- Version 3881ac441f642d56503818123446f7298442236b and below 4fa349156043dc119721d067329714179f501749 is affected.
- Version 3.2 is affected.
- Before 3.2 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.