High severity7.8NVD Advisory· Published Jul 19, 2026· Updated Oct 8, 2026
CVE-2026-64004
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.
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Affected products
15- osv-coords14 versionspkg:rpm/opensuse/dtb-aarch64&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-kvmsmall&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-obs-build&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-obs-qa&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-source&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-syms&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-zfcpdump&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-azure&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-64kb&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-default-base&distro=openSUSE%20Leap%2016.0pkg:linux/kernelpkg:rpm/opensuse/kernel-docs&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-rt&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/kernel-default&distro=openSUSE%20Leap%2016.0
< 6.12.0-160000.38.1+ 13 more
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1.160000.2.22
- (no CPE)range: >= 3.4.0, < 5.10.259
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
- (no CPE)range: < 6.12.0-160000.38.1
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbeenvdPatch
- git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88nvdPatch
- git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cbnvdPatch
- git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920nvdPatch
- git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8anvdPatch
- git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590ddnvdPatch
- git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79nvdPatch
- git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5envdPatch
News mentions
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