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CVE Vulnerability Details :

CVE-2026-64004

PUBLISHED

More Info Official Page

Assigner-Linux

Assigner Org ID-416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published At-19 Jul, 2026 | 14:56

Updated At-20 Jul, 2026 | 13:42

▼CVE Numbering Authority (CNA)

net/iucv: fix locking in .getsockopt

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

Vendor

Linux Kernel Organization, Inc

Product

Linux

Repo

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Program Files

net/iucv/af_iucv.c

Default Status

unaffected

Versions

Affected

From 51363b8751a673a00ad48eea895266396d53fa52 before 884eb247b74d86db97e3a37f0d6fc8e1e83590dd (git)
From 51363b8751a673a00ad48eea895266396d53fa52 before 45bb8de8c95d8899f4b8f61bd9bceb8132af73cb (git)
From 51363b8751a673a00ad48eea895266396d53fa52 before 1fc30bd4e55e2dd622d2d366cecd732c1841bbee (git)
From 51363b8751a673a00ad48eea895266396d53fa52 before cd691beafea0dd779e69e81ccc26b0ab50efcb5e (git)
From 51363b8751a673a00ad48eea895266396d53fa52 before 6e792b8dd3002bbc4136745928a9605df1a72b8a (git)
From 51363b8751a673a00ad48eea895266396d53fa52 before 9817369243380e287ebe5525411557eaa3aa2a79 (git)
From 51363b8751a673a00ad48eea895266396d53fa52 before 69554adc7a6fa04ede3ad7512321d83748e3c920 (git)
From 51363b8751a673a00ad48eea895266396d53fa52 before 3589d20a666caf30ad100c960a2de7de390fce88 (git)

Vendor

Linux Kernel Organization, Inc

Product

Linux

Repo

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Program Files

net/iucv/af_iucv.c

Default Status

affected

Versions

Affected

Unaffected

From 0 before 3.4 (semver)
From 5.10.259 through 5.10.* (semver)
From 5.15.210 through 5.15.* (semver)
From 6.1.176 through 6.1.* (semver)
From 6.6.143 through 6.6.* (semver)
From 6.12.93 through 6.12.* (semver)
From 6.18.35 through 6.18.* (semver)
From 7.0.12 through 7.0.* (semver)
From 7.1 through * (original_commit_for_fix)

Metrics

Version	Base score	Base severity	Vector
3.1	7.8	HIGH	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Version: 3.1

Base score: 7.8

Base severity: HIGH

Vector:

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Hyperlink	Resource
https://git.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590dd	N/A
https://git.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cb	N/A
https://git.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbee	N/A
https://git.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e	N/A
https://git.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8a	N/A
https://git.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79	N/A
https://git.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920	N/A
https://git.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88	N/A