CVE-2026-64004

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux51363b8751a673a00ad48eea895266396d53fa52 < 884eb247b74d86db97e3a37f0d6fc8e1e83590ddaffected
LinuxLinux51363b8751a673a00ad48eea895266396d53fa52 < 45bb8de8c95d8899f4b8f61bd9bceb8132af73cbaffected
LinuxLinux51363b8751a673a00ad48eea895266396d53fa52 < 1fc30bd4e55e2dd622d2d366cecd732c1841bbeeaffected
LinuxLinux51363b8751a673a00ad48eea895266396d53fa52 < cd691beafea0dd779e69e81ccc26b0ab50efcb5eaffected
LinuxLinux51363b8751a673a00ad48eea895266396d53fa52 < 6e792b8dd3002bbc4136745928a9605df1a72b8aaffected
LinuxLinux51363b8751a673a00ad48eea895266396d53fa52 < 9817369243380e287ebe5525411557eaa3aa2a79affected
LinuxLinux51363b8751a673a00ad48eea895266396d53fa52 < 69554adc7a6fa04ede3ad7512321d83748e3c920affected
LinuxLinux51363b8751a673a00ad48eea895266396d53fa52 < 3589d20a666caf30ad100c960a2de7de390fce88affected
LinuxLinux3.4affected
LinuxLinux0 < 3.4unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References