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CVE-2023-4881

Publication date 11 September 2023

Last updated 24 July 2024

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

7.1 · High

Score breakdown

** REJECT ** CVE-2023-4881 was wrongly assigned to a bug that was deemed to be a non-security issue by the Linux kernel security team.

From the Ubuntu Security Team

Alex Birnberg discovered that the netfilter subsystem in the Linux kernel did not properly validate register length, leading to an out-of- bounds write vulnerability. A local attacker could possibly use this to cause a denial of service (system crash).

Read the notes from the security team

Why is this CVE high priority?

By using unprivileged user namespaces, this can be exploited to achieve denial of service.

Learn more about Ubuntu priority

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Notes

rodrigo-zaiden

ZDI-CAN-21950, ZDI-CAN-21951, ZDI-CAN-21961.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
linux

Severity score breakdown

Parameter Value
Base score 7.1 · High
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

References

Related Ubuntu Security Notices (USN)

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Other references