Description
There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | lz4 | lz4-1.8.3 | — |
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 | lz4 | 1.9.3-2 | — |
| Debian 13 | lz4 | 1.9.3-2 | — |
| Debian 12 | lz4 | 1.9.3-2 | — |
| Debian 10 | lz4 | 1.8.3-1+deb10u1 | DSA-4919-1 |
| Debian 9 | lz4 | 0.0~r131-2+deb9u1 | DLA-2657-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | lz4 | 1.9.2-2ubuntu0.20.04.1 | USN-4968-1 |
| Ubuntu 18.04 LTS | lz4 | 0.0~r131-2ubuntu3.1 | USN-4968-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | lz4 | 0.0~r131-2ubuntu2+esm1 | USN-4968-2 |
| Ubuntu Pro 14.04 LTS | lz4 | 0.0~r114-2ubuntu1+esm2 | USN-4968-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | lz4 +2 | 1.8.3-3.el8_4 | RHSA-2021:2575 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | lz4 +2 | 1.8.3-3.el8_4 | ALSA-2021:2575 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | lz4 | 1.8.3-3.el8_4 | RLSA-2021:2575 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | lz4 | 1.9.2-3.3.1 | SUSE-SU-2021:1825-1 |
| SLES 15 SP2 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SLES 15 SP1 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SLES 15 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SLES 12 SP5 | lz4 | 1.8.0-3.3.1 | SUSE-SU-2021:1613-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SLES for SAP 15 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SLE Micro 5.0 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SLE HPC 15 SP1 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SLE HPC 15 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SUSE Manager Server 4.0 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SUSE Manager Retail Branch Server 4.0 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SUSE Manager Proxy 4.0 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
| SUSE Enterprise Storage 6 | lz4 | 1.8.0-3.8.1 | SUSE-SU-2021:1647-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | lz4 | 1.9.3-2.1 | openSUSE-SU-2024:11562-1 |
| openSUSE Leap 15.3 | lz4 | 1.9.2-3.3.1 | openSUSE-SU-2021:1825-1 |
| openSUSE Leap 15.2 | lz4 +1 | 1.8.0-lp152.5.3.1 | openSUSE-SU-2021:0760-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | lz4 | 1.9.3-r1 | — |
| Alpine v3.23 | lz4 | 1.9.3-r1 | — |
| Alpine v3.22 | lz4 | 1.9.3-r1 | — |
| Alpine v3.21 | lz4 | 1.9.3-r1 | — |
| Alpine v3.20 | lz4 | 1.9.3-r1 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | lz4 | 1.9.3-r1 | — |
| Alpine v3.18 | lz4 | 1.9.3-r1 | — |
| Alpine v3.17 | lz4 | 1.9.3-r1 | — |
| Alpine v3.16 | lz4 | 1.9.3-r1 | — |
| Alpine v3.15 | lz4 | 1.9.3-r1 | — |
| Alpine v3.14 | lz4 | 1.9.3-r1 | — |
| Alpine v3.13 | lz4 | 1.9.2-r1 | — |
| Alpine v3.12 | lz4 | 1.9.2-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | lz4 +3 | 1.9.4-1.amzn2023.0.2 | ALAS2023-2023-015 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | suitesparse | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | lz4 +2 | 1.8.3-3.el8_4 | ELSA-2021-2575 |
Advisories 21
- ALSA-2021:2575 Moderate: lz4 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2021:2575 Red Hat Security Advisory: lz4 security update Red Hat Security Advisories (RHSA) · Oct 13, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2025-0227 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- WID-SEC-2023-1350 Splunk Splunk Enterprise: Mehrere Schwachstellen in Komponenten von Drittanbietern BSI CERT-Bund (WID) · Jul 1, 2026
- USN-4968-2 lz4 vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-4968-1 lz4 vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4919-1 lz4 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2657-1 lz4 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:2575 Moderate: lz4 security update Rocky Linux Security Advisories · Feb 5, 2026
- openSUSE-SU-2024:11562-1 liblz4-1-1.9.3-2.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0760-1 Security update for lz4 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1825-1 Security update for lz4 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1613-1 Security update for lz4 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1825-1 Security update for lz4 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-2229 Splunk Splunk Enterprise: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- SUSE-SU-2021:1647-1 Security update for lz4 SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2022-0721 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 19, 2024
- ALAS2023-2023-015 Moderate: lz4 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 22, 2023
- ELSA-2021-2575 Moderate: lz4 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 30, 2021