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Ubuntu 22.04 LTS OpenSBI Denial of Service Vulnerability Disclosed

Ubuntu 22.04 LTS OpenSBI Denial of Service Vulnerability Disclosed

First seen 30 Sep 2026, 19:28 UTC • •
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ThreatCluster AI
ThreatCluster •September 30, 2026 at 20:30 UTC

A vulnerability in OpenSBI was discovered that allows an attacker to cause a denial of service by sending specially crafted input. This flaw affects Ubuntu 22.04 LTS systems running OpenSBI versions prior to 1.3-1ubuntu0.22.04.3. The issue arises from improper validation of the counter index mask in SBI PMU extension requests. Users are advised to update their systems to mitigate this risk. A standard system update will apply the necessary changes. No has been reported at this time. The vulnerability has been assigned the identifier USN-8853-1.

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Timeline

2026-09-30
Vulnerability disclosed
OpenSBI vulnerability affecting Ubuntu 22.04 LTS was disclosed, allowing denial of service through crafted input.
Linuxsecurity
2026-09-30
Patch released
Ubuntu released a patch for OpenSBI, updating it to version 1.3-1ubuntu0.22.04.3 to address the vulnerability.
Ubuntu

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Common questions

Which versions of OpenSBI are affected?
OpenSBI versions prior to 1.3-1ubuntu0.22.04.3 on Ubuntu 22.04 LTS are affected.
Is there a patch available?
Yes, users should update to OpenSBI version 1.3-1ubuntu0.22.04.3 to mitigate the vulnerability.
Has this vulnerability been exploited in the wild?
No active exploitation has been reported at this time.