CVE-2026-99042 Linux Kernel - Broken Access Control

Linux kernel io_uring/net contains a bypass vulnerability caused by incorrect threshold for populating CONNECT filter fields in sockaddr_in6, letting attackers bypass IPv6 port/address filtering, exploit requires crafted IPv6 connect requests with 24-byte sockaddr_in6.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Published
23 October 2026
Updated
25 October 2026

Vendor fix

Update to Linux kernel version 7.3-rc6 or later where the threshold mismatch is fixed.

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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