SB2026061741 - Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.19
Published: June 17, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Stack-based buffer overflow (CVE-ID: CVE-2026-43037)
CWE-ID: CWE-121 - Stack-based buffer overflow
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a stack-based buffer overflow in ip4ip6_err() and __ip_options_echo() when processing a crafted packet that triggers ICMP error handling on a cloned skb. A remote attacker can send a specially crafted packet to execute arbitrary code.
The issue is caused by reusing skb cb[] data written by the IPv6 receive path as IPv4 metadata, allowing attacker-controlled packet data to influence the copied option length.
2) Improper access control (CVE-ID: CVE-2026-41326)
CWE-ID: CWE-284 - Improper Access Control
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 overwrite files inside the guest workload image and disclose sensitive information from containers.
The vulnerability exists due to improper access control in the CopyFile policy and CopyFile handler when processing crafted CopyFile requests involving symlinks. A remote attacker can create a symlink from the shared directory to an arbitrary path and then send a second crafted CopyFile request to overwrite files inside the guest workload image and disclose sensitive information from containers.
The issue affects deployments using the upstream genpolicy implementation and is relevant to Confidential Containers workloads whose trust model forbids host access to container images.
Remediation
Install update from vendor's website.