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Critical Linux Kernel Vulnerabilities Affecting Ubuntu Systems

Critical Linux Kernel Vulnerabilities Affecting Ubuntu Systems

First seen 21 Aug 2026, 00:22 UTC • •
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ThreatCluster AI
ThreatCluster •August 21, 2026 at 23:48 UTC
  • •Critical vulnerabilities in the Linux kernel affect Ubuntu 24.04 and 26.04 LTS.
  • •CVE-2025-54518 allows privilege escalation via AMD Zen 2 processors.
  • •Immediate system updates are required to mitigate risks from these vulnerabilities.

Multiple security vulnerabilities have been identified in the Linux kernel affecting Ubuntu 24.04 and 26.04 LTS. Key issues include improper isolation of shared resources in AMD Zen 2 processors, leading to potential privilege escalation (CVE-2025-54518). Additional vulnerabilities involve data exposure in AMD processors during speculative execution (CVE-2025-54505) and improper handling of entropy in AMD Zen 5 processors (CVE-2025-62626). These vulnerabilities can be exploited by local attackers to compromise system integrity and confidentiality. Users are advised to update their systems immediately to mitigate these risks. The updates require a system reboot and may necessitate recompilation of third-party kernel modules. The vulnerabilities were disclosed on August 20, 2026, and patches are available.

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Timeline

2025-02-27
CVE-2025-21709 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2025-04-16
CVE-2025-22116 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2025-07-25
CVE-2025-38426 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2025-09-11
CVE-2025-39764 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2025-11-12
CVE-2025-40150 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2025-11-12
CVE-2025-40135 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2025-11-21
CVE-2025-62626 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2025-12-16
CVE-2025-68175 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2025-12-16
CVE-2025-68239 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2025-12-22
CVE-2025-68334 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE

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