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CVE-2026-68397

net/iucv: take a reference on the socket found in afiucv_hs_rcv()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 3881ac441f642d56503818123446f7298442236b · fixed in 5739be5c19495d709d902a2912c9102ce78740d5; From 3881ac441f642d56503818123446f7298442236b · fixed in bc6c6e546ffff8865daaeb622ef348c2d481e80f; From 3881ac441f642d56503818123446f7298442236b · fixed in e3e0679fc950191aff8f27fa78abcfc2462cff4a; From 3881ac441f642d56503818123446f7298442236b · fixed in 4dc0e63abf8bc7ba8892e617c1fb8b204361e022; From 3881ac441f642d56503818123446f7298442236b · fixed in 1801cb20a5025a787d6853e19c38db138344b4b4; From 3881ac441f642d56503818123446f7298442236b · fixed in c75a950e77356e526672cba4584080c6c8b793b6; From 3881ac441f642d56503818123446f7298442236b · fixed in 5595ea59cdf29182cf6a270cacc1426c57b603de; From 3881ac441f642d56503818123446f7298442236b · fixed in 4fa349156043dc119721d067329714179f501749

  • Linux Linux

    3.2

  • KernelLinux

    From 3.2.0 · fixed in 5.10.265; From 5.11.0 · fixed in 5.15.216; From 5.16.0 · fixed in 6.1.183; From 6.2.0 · fixed in 6.6.148; From 6.7.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6

References 8

git.kernel.org