Ubuntu Security Updates Summary:
Ubuntu has released two significant security updates addressing vulnerabilities in Synapse and the Linux kernel (GCP) as part of its ongoing commitment to user security. The updates were announced on April 22, 2025, and affect various versions of Ubuntu, including 22.04 LTS, 20.04 LTS, and 18.04 LTS.
1. Synapse Vulnerabilities (USN-7444-1):
Synapse, a Matrix homeserver written in Python/Twisted, has seen several vulnerabilities addressed, including:
- Bypass of Network Policies: Attackers could bypass authentication via specially crafted URLs (CVE-2023-32683).
- Exposure of Cached Device Information: Sensitive information could potentially be accessed (CVE-2023-43796).
- Denial of Service: Manipulation of state changes could lead to service disruption (CVE-2022-39374).
- Temporary Storage of User Credentials: Sensitive data might be exposed (CVE-2023-41335).
- Authorization Event Issues: Incorrect responses could allow authentication bypass (CVE-2022-39335).
- Message Manipulation: Attackers could mark messages as read without viewing them (CVE-2023-42453).
- Memory-related Crashes: These could lead to service outages (CVE-2024-31208).
- Unchecked Thumbnail Rendering: This vulnerability could permit arbitrary code execution (CVE-2024-53863).
To mitigate these vulnerabilities, users are advised to update their systems to the specified package versions and restart Synapse.
2. Linux Kernel Vulnerabilities (USN-7402-5):
The update for the Linux kernel addresses multiple security issues that could compromise systems running on Google Cloud Platform (GCP). Notable vulnerabilities include:
- Flaws in the block layer subsystem, GPU drivers, HID subsystem, media drivers, JFS file system, network namespace, networking core, and Netlink (CVE-2024-57798, CVE-2024-53140, CVE-2024-56595, CVE-2024-56598, CVE-2024-50302, CVE-2024-56658, CVE-2024-56672, CVE-2024-53063).
Users should update their systems to the new kernel versions and reboot to apply the changes. Importantly, due to an ABI change, users with third-party kernel modules will need to recompile and reinstall them.
Conclusion:
Both updates are crucial for maintaining the security and integrity of Ubuntu systems. It is highly recommended that users promptly apply these updates to safeguard against potential attacks and vulnerabilities. For further details and instructions, users can refer to the official Ubuntu security notices linked above
Ubuntu has released two significant security updates addressing vulnerabilities in Synapse and the Linux kernel (GCP) as part of its ongoing commitment to user security. The updates were announced on April 22, 2025, and affect various versions of Ubuntu, including 22.04 LTS, 20.04 LTS, and 18.04 LTS.
1. Synapse Vulnerabilities (USN-7444-1):
Synapse, a Matrix homeserver written in Python/Twisted, has seen several vulnerabilities addressed, including:
- Bypass of Network Policies: Attackers could bypass authentication via specially crafted URLs (CVE-2023-32683).
- Exposure of Cached Device Information: Sensitive information could potentially be accessed (CVE-2023-43796).
- Denial of Service: Manipulation of state changes could lead to service disruption (CVE-2022-39374).
- Temporary Storage of User Credentials: Sensitive data might be exposed (CVE-2023-41335).
- Authorization Event Issues: Incorrect responses could allow authentication bypass (CVE-2022-39335).
- Message Manipulation: Attackers could mark messages as read without viewing them (CVE-2023-42453).
- Memory-related Crashes: These could lead to service outages (CVE-2024-31208).
- Unchecked Thumbnail Rendering: This vulnerability could permit arbitrary code execution (CVE-2024-53863).
To mitigate these vulnerabilities, users are advised to update their systems to the specified package versions and restart Synapse.
2. Linux Kernel Vulnerabilities (USN-7402-5):
The update for the Linux kernel addresses multiple security issues that could compromise systems running on Google Cloud Platform (GCP). Notable vulnerabilities include:
- Flaws in the block layer subsystem, GPU drivers, HID subsystem, media drivers, JFS file system, network namespace, networking core, and Netlink (CVE-2024-57798, CVE-2024-53140, CVE-2024-56595, CVE-2024-56598, CVE-2024-50302, CVE-2024-56658, CVE-2024-56672, CVE-2024-53063).
Users should update their systems to the new kernel versions and reboot to apply the changes. Importantly, due to an ABI change, users with third-party kernel modules will need to recompile and reinstall them.
Conclusion:
Both updates are crucial for maintaining the security and integrity of Ubuntu systems. It is highly recommended that users promptly apply these updates to safeguard against potential attacks and vulnerabilities. For further details and instructions, users can refer to the official Ubuntu security notices linked above
Synapse and Kernel updates for Ubuntu
Ubuntu Linux has received two important security updates: [USN-7444-1] which addresses vulnerabilities in Synapse, and [USN-7402-5] which addresses vulnerabilities in the Linux kernel (GCP)
[USN-7444-1] Synapse vulnerabilities
[USN-7402-5] Linux kernel (GCP) vulnerabilities
