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[USN-8248-1] NASM vulnerabilities

Posted on 07 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8248-1
May 07, 2026

nasm vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in NASM.

Software Description:
- nasm: Netwide Assembler

Details:

Daisy Chen discovered that NASM was vulnerable to a heap buffer overflow
when handling certain input. An attacker could possibly use this issue
to cause NASM to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2023-31722)

It was discovered that NASM incorrectly handled memory allocation.
An attacker could possibly use this issue to cause NASM to use
excessive resources, leading to a denial of service. This issue
only affected Ubuntu 24.04 LTS. (CVE-2021-33452, CVE-2021-33450)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
nasm 2.16.01-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
nasm 2.15.05-1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary
changes.

References:
https://ubuntu.com/security/notices/USN-8248-1
CVE-2021-33450, CVE-2021-33452, CVE-2023-31722

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