Description
An issue was discovered in the function expr6 in eval.c in Netwide Assembler (NASM) through 2.14.02. There is a stack exhaustion problem caused by the expr6 function making recursive calls to itself in certain scenarios involving lots of '!' or '+' or '-' characters. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted asm file.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nasm | No fix yet | — |
| Debian 13 | nasm | No fix yet | — |
| Debian 12 | nasm | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nasm | No fix yet | — |
| Ubuntu 26.04 LTS | nasm | No fix yet | — |
| Ubuntu 25.10 | nasm | No fix yet | — |
| Ubuntu 20.04 LTS | nasm | No fix yet | — |
| Ubuntu 18.04 LTS | nasm | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | nasm | No fix yet | — |
| Ubuntu Pro 24.04 LTS | nasm | No fix yet | — |
| Ubuntu Pro 22.04 LTS | nasm | No fix yet | — |