CVE-2026-64004 (GCVE-0-2026-64004)
Vulnerability from cvelistv5
Published
2026-07-19 14:56
Modified
2026-10-19 20:18
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix locking in .getsockopt Mirror iucv_sock_setsockopt() and wrap the whole switch in lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock becomes redundant and is removed. Any AF_IUCV HIPER user can potentially crash the kernel by racing recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences iucv->hs_dev->mtu after iucv_sock_close() (called from the racing recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference oops.
References
Impacted products
Vendor Product Version
Linux Linux Version: 51363b8751a673a00ad48eea895266396d53fa52
Version: 51363b8751a673a00ad48eea895266396d53fa52
Version: 51363b8751a673a00ad48eea895266396d53fa52
Version: 51363b8751a673a00ad48eea895266396d53fa52
Version: 51363b8751a673a00ad48eea895266396d53fa52
Version: 51363b8751a673a00ad48eea895266396d53fa52
Version: 51363b8751a673a00ad48eea895266396d53fa52
Version: 51363b8751a673a00ad48eea895266396d53fa52
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