CVE-2026-81003 Linux Kernel - Broken Access Control

Linux kernel contains an AF_IUCV socket binding vulnerability caused by lack of ingress device verification in afiucv_hs_rcv(), letting attackers inject data, exhaust accept queues, or spoof peers across network namespaces, exploit requires sending crafted frames on the same HiperSockets segment.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.31% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Denial Of Service, Data Tampering, Information Disclosure
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for ingress device verification in afiucv_hs_rcv()

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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