Description
ldebug.c in Lua 5.4.0 allows a negation overflow and segmentation fault in getlocal and setlocal, as demonstrated by getlocal(3,2^31).
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 | lua5.3 | 5.3.6-1 | — |
| Debian 14 | lua5.4 | 5.4.1-1 | — |
| Debian 13 | lua5.3 | 5.3.6-1 | — |
| Debian 13 | lua5.4 | 5.4.1-1 | — |
| Debian 12 | lua5.3 | 5.3.6-1 | — |
| Debian 12 | lua5.4 | 5.4.1-1 | — |
| Debian 10 | lua5.3 | 5.3.3-1.1+deb10u1 | DLA-3469-1 |
| Debian 9 | lua5.3 | 5.3.3-1+deb9u1 | DLA-2381-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | lua +2 | 5.3.4-12.el8 | RHSA-2021:4510 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | lua +2 | 5.3.4-12.el8 | ALSA-2021:4510 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | lua | 5.3.4-12.el8 | RLSA-2021:4510 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | lua53 | 5.3.6-3.6.1 | SUSE-SU-2021:2196-1 |
| SLES 15 SP2 | lua53 | 5.3.6-3.6.1 | SUSE-SU-2021:2196-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.0 | lua53 | 5.3.6-3.6.1 | SUSE-SU-2021:2196-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | lua55 | 5.5.0~beta1-1.1 | openSUSE-SU-2025:15401-1 |
| openSUSE Leap 15.3 | lua53 | 5.3.6-3.6.1 | openSUSE-SU-2021:2196-1 |
| openSUSE Leap 15.2 | lua53 | 5.3.6-lp152.5.3.1 | openSUSE-SU-2021:0962-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | lua53 +3 | 5.3.5-7.amzn2.0.1 | ALAS2-2020-1492 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | lua | 5.4.6-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | lua +2 | 5.3.4-12.el8 | ELSA-2021-4510 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 2 repositories
-
RenukaSelvar/lua_CVE-2020-24370 ★ 0 · Nov 6, 2024
-
RenukaSelvar/lua_CVE-2020-24370_AfterPatch ★ 0 · Nov 6, 2024
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 13
- ALSA-2021:4510 Low: lua security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2022-0571 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 28, 2026
- RHSA-2021:4510 Red Hat Security Advisory: lua security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- openSUSE-SU-2025:15401-1 liblua5_5-5-5.5.0~beta1-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-2381-1 lua5.3 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3469-1 lua5.3 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:4510 Low: lua security update Rocky Linux Security Advisories · Feb 5, 2026
- openSUSE-SU-2021:0962-1 Security update for lua53 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:2196-1 Security update for lua53 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:2196-1 Security update for lua53 SUSE / openSUSE Security Updates · Feb 4, 2026
- SCA-2025-0006 Vulnerability affecting picoScan and multiScan SICK PSIRT · Apr 28, 2025
- ELSA-2021-4510 Low: lua security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 16, 2021
- ALAS2-2020-1492 Low: lua53 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Sep 16, 2020
References
- http://lua-users.org/lists/lua-l/2020-07/msg00324.html
- https://github.com/lua/lua/commit/a585eae6e7ada1ca9271607a4f48dfb17868ab7b
- FEDORA-2020-d7ed9f18ff vendor-advisory
- FEDORA-2020-c83556709c vendor-advisory
- [debian-lts-announce] 20200926 [SECURITY] [DLA 2381-1] lua5.3 security update mailing-list
- [debian-lts-announce] 20230622 [SECURITY] [DLA 3469-1] lua5.3 security update mailing-list