CVE-2026-64004

Description

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

• https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee
• https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88
• https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb
• https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920
• https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a