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.
Affected products
linux: linux kernel
References8
- git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee Patch
- git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88 Patch
- git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb Patch
- git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920 Patch
- git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a Patch
- git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd Patch
- git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79 Patch
- git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e Patch
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 1 · as of 14 November 2026
- CWE
- CWE-667CWE-362
Could this be exploited in your environment?
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