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CVE-2026-63886

kernel: scsi: target: iscsi: Validate CHAP_R length before base64 decode

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Severity

Important

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · July 19, 2026

Updated · October 13, 2026

Description

A flaw was found in the Linux kernel's iSCSI target functionality. This vulnerability allows a remote attacker to cause a buffer overflow by sending a specially crafted Challenge-Handshake Authentication Authentication Protocol (CHAP) response. The system fails to validate the length of the BASE64-encoded CHAP response before decoding it, leading to memory corruption. This could potentially lead to a denial of service or other unpredictable system behavior.

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 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-805 · Buffer Access with Incorrect Length Value