CVE-2026-43452

HighCVSS 8.2/10Last modified Nov 11, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: x_tables: guard option walkers against 1-byte tail reads

When the last byte of options is a non-single-byte option kind, walkers that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end of the option area.

Add an explicit i == optlen - 1 check before dereferencing op[i + 1] in xt_tcpudp and xt_dccp option walkers.

Metrics

CVSS 3.1 8.2/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Weakness enumeration

CWE-125

Affected software

VendorProductVersions
LinuxLinux>= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc, < c2a445367a496a3c25dbc940c10c8bd1cfd4c14a; >= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc, < ae1e1267650638136b84c23f2b31250f0ccb6823; >= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc, < c39f84e4be1be63fc60ca7141ea7b76edcea5907; >= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc, < 9b94f0e42ed248eb31929da84ed9f5310d7ff540; >= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc, < 5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c; >= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc, < bc18551c6169eac5ed813778d3e3e484002dbbe5; >= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc, < d04800323336eebf441d153f43234eac9b833d36; >= 2e4e6a17af35be359cc8f1c924f8f198fbd478cc, < cfe770220ac2dbd3e104c6b45094037455da81d4
LinuxLinux2.6.16

References

Timeline

Published
May 8, 2026
Last modified
Nov 11, 2026
NVD status
Modified

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CVE-2026-43452: High severity, CVSS 8.2 | Vulnix