Cloudanix VulnDB

CVE-2026-23455

Critical · 9.1

CVSS

9.1

EPSS

1.3%

Published

Apr 3, 2026

CISA due date

—

The record

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_h323: check for zero length in DecodeQ931() In DecodeQ931(), the UserUserIE code path reads a 16-bit length from the packet, then decrements it by 1 to skip the protocol discriminator byte before passing it to DecodeH323_UserInformation(). If the encoded length is 0, the decrement wraps to -1, which is then passed as a large value to the decoder, leading to an out-of-bounds read. Add a check to ensure len is positive after the decrement.

Affected packages

Ecosystem Package Introduced Fixed

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