CVE-2026-64004
net/iucv: fix locking in .getsockopt
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jul 19, 2026 |
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Affected Versions
Linux / Linux
51363b8751a673a00ad48eea895266396d53fa52 < 884eb247b74d86db97e3a37f0d6fc8e1e83590dd 51363b8751a673a00ad48eea895266396d53fa52 < 45bb8de8c95d8899f4b8f61bd9bceb8132af73cb 51363b8751a673a00ad48eea895266396d53fa52 < 1fc30bd4e55e2dd622d2d366cecd732c1841bbee 51363b8751a673a00ad48eea895266396d53fa52 < cd691beafea0dd779e69e81ccc26b0ab50efcb5e 51363b8751a673a00ad48eea895266396d53fa52 < 6e792b8dd3002bbc4136745928a9605df1a72b8a 51363b8751a673a00ad48eea895266396d53fa52 < 9817369243380e287ebe5525411557eaa3aa2a79 51363b8751a673a00ad48eea895266396d53fa52 < 69554adc7a6fa04ede3ad7512321d83748e3c920 51363b8751a673a00ad48eea895266396d53fa52 < 3589d20a666caf30ad100c960a2de7de390fce88
Linux / Linux
3.4
References
git.kernel.org: https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd git.kernel.org: https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb git.kernel.org: https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee git.kernel.org: https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e git.kernel.org: https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a git.kernel.org: https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79 git.kernel.org: https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920 git.kernel.org: https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88