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CVE-2026-64004

HIGHCVSS 7.8/10EPSS 0.13%

Last modified

CVE-2026-64004 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

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

EPSS Probability
0.13%

3.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 51363b8751a673a00ad48eea895266396d53fa52, < 884eb247b74d86db97e3a37f0d6fc8e1e83590dd; >= 51363b8751a673a00ad48eea895266396d53fa52, < 45bb8de8c95d8899f4b8f61bd9bceb8132af73cb; >= 51363b8751a673a00ad48eea895266396d53fa52, < 1fc30bd4e55e2dd622d2d366cecd732c1841bbee; >= 51363b8751a673a00ad48eea895266396d53fa52, < cd691beafea0dd779e69e81ccc26b0ab50efcb5e; >= 51363b8751a673a00ad48eea895266396d53fa52, < 6e792b8dd3002bbc4136745928a9605df1a72b8a; >= 51363b8751a673a00ad48eea895266396d53fa52, < 9817369243380e287ebe5525411557eaa3aa2a79; >= 51363b8751a673a00ad48eea895266396d53fa52, < 69554adc7a6fa04ede3ad7512321d83748e3c920; >= 51363b8751a673a00ad48eea895266396d53fa52, < 3589d20a666caf30ad100c960a2de7de390fce88
LinuxLinux3.4

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64004?
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.
How severe is CVE-2026-64004?
CVE-2026-64004 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64004?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST