SB2026070770 - Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.21
Published: July 7, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-42009)
CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation
CVSSv4: 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/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper implementation of a qsort comparator contract in the DTLS packet sequence number comparator when ordering DTLS packets by sequence numbers. A remote attacker can send DTLS packets with duplicate sequence numbers to cause a denial of service.
2) Improper Authentication (CVE-ID: CVE-2026-42010)
CWE-ID: CWE-287 - Improper Authentication
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to bypass authentication.
The vulnerability exists due to improper authentication in RSA-PSK username matching when processing usernames containing a NUL character. A remote attacker can supply a specially crafted username to bypass authentication.
3) Improper input validation (CVE-ID: CVE-2026-46243)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to improper input validation in the cifs.spnego key description handling in fs/smb/client/cifs_spnego.c when processing userspace-created cifs.spnego keys through request_key(2) or add_key(2). A local user can supply a crafted cifs.spnego description to disclose sensitive information, modify data, or cause a denial of service.
The issue arises because authority-bearing fields such as pid, uid, creduid, and upcall_target may be treated by cifs.upcall as kernel-originating inputs.
Remediation
Install update from vendor's website.