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[USN-8248-2] NASM regression

Posted on 08 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8248-2
May 08, 2026

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

- Ubuntu 24.04 LTS

Summary:

USN-8248-1 introduced a regression in NASM

Software Description:
- nasm: Netwide Assembler

Details:

USN-8248-1 fixed vulnerabilities in NASM. Unfortunately the update
introduced a regression which could cause NASM to crash. This update fixes
the problem by reverting the fix for CVE-2021-33450 and CVE-2021-33452 in
Ubuntu 24.04 LTS.

We apologize for the inconvenience.

Original advisory 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~esm2
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8248-2
https://ubuntu.com/security/notices/USN-8248-1
CVE-2021-33450, CVE-2021-33452, https://launchpad.net/bugs/2151861

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