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.
Metadata
Severity & Metrics
No CVSS data available.
Affected products (2)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| Linux | Linux | — | 51363b8751a673a00ad48eea895266396d53fa52 < 884eb247b74d86db97e3a37f0d6fc8e1e83590dd, 51363b8751a673a00ad48eea895266396d53fa52 < 45bb8de8c95d8899f4b8f61bd9bceb8132af73cb, 51363b8751a673a00ad48eea895266396d53fa52 < 1fc30bd4e55e2dd622d2d366cecd732c1841bbee, 51363b8751a673a00ad48eea895266396d53fa52 < cd691beafea0dd779e69e81ccc26b0ab50efcb5e … |
| Linux | Linux | — | 3.4, 0 < 3.4, 5.10.259 ≤ 5.10.*, 5.15.210 ≤ 5.15.* … |
References (8)
- https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd
- https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb
- https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee
- https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e
- https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a
- https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79
- https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920
- https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88