SB20260720367 - Heap-based buffer overflow in Linux kernel target iscsi driver

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Main Vulnerability Database SB20260720367

SB20260720367 - Heap-based buffer overflow in Linux kernel target iscsi driver

Published: July 20, 2026

Security Bulletin ID SB20260720367
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Heap-based buffer overflow (CVE-ID: CVE-2026-63887)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a heap-based buffer overflow in iscsi_encode_text_output() when processing iSCSI login text parameters. A remote attacker can send a specially crafted login request with many minimal key-value pairs to cause a denial of service.

The issue can be triggered by expansion of unknown keys into larger "NotUnderstood" response records during login negotiation.


Remediation

Install update from vendor's website.

References