CVE-2026-23247

kernel: Linux kernel: Information disclosure via off-path TCP source port leakage

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Severity

Low

Red Hat Product Security

5.3

CVSS 3.1

Review impact separately from score.

Published · March 18, 2026

Updated · September 28, 2026

Description

A flaw was found in the Linux kernel. A remote attacker can exploit an off-path TCP source port leakage through a SYN cookie side-channel. This vulnerability leads to information disclosure by reducing the effective randomness of TCP connection parameters, which may make certain blind injection or connection tracking attacks more feasible.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE-341 · Predictable from Observable State