Description
A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | GnuTLS | Fixed in gnutls v3.7.3 | — |
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 | gnutls28 | 3.7.3-2 | — |
| Debian 13 | gnutls28 | 3.7.3-2 | — |
| Debian 12 | gnutls28 | 3.7.3-2 | — |
| Debian 10 | gnutls28 | 3.6.7-4+deb10u9 | DLA-3070-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | gnutls28 | 3.7.3-4ubuntu1.1 | USN-5550-1 |
| Ubuntu 20.04 LTS | gnutls28 | 3.6.13-2ubuntu1.7 | USN-5550-1 |
| Ubuntu 18.04 LTS | gnutls28 | 3.5.18-1ubuntu1.6 | USN-5550-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | gnutls28 | 3.4.10-4ubuntu1.9+esm1 | USN-5750-1 |
| Ubuntu Pro 14.04 LTS | gnutls26 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | gnutls | 3.6.7-14.16.1 | SUSE-SU-2022:0717-1 |
| SLES 15 SP1 | gnutls | 3.6.7-150000.6.45.2 | SUSE-SU-2022:2830-1 |
| SLES 15 | gnutls | 3.6.7-150000.6.45.2 | SUSE-SU-2022:2830-1 |
| SLES 12 SP5 | gnutls | 3.3.27-3.6.1 | SUSE-SU-2022:0678-1, SUSE-SU-2022:0677-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP1 | gnutls | 3.6.7-150000.6.45.2 | SUSE-SU-2022:2830-1 |
| SLES for SAP 15 | gnutls | 3.6.7-150000.6.45.2 | SUSE-SU-2022:2830-1 |
| SLES for SAP 12 SP5 | gnutls | 3.3.27-3.6.1 | SUSE-SU-2022:0678-1, SUSE-SU-2022:0677-1 |
| SLE Real Time 15 SP2 | gnutls | 3.6.7-14.16.1 | SUSE-SU-2022:0717-1 |
| SLE Micro 5.1 | gnutls | 3.6.7-14.16.1 | SUSE-SU-2022:0717-1 |
| SLE Micro 5.0 | gnutls | 3.6.7-14.16.1 | SUSE-SU-2022:0717-1 |
| SLE HPC 15 SP1 | gnutls | 3.6.7-150000.6.45.2 | SUSE-SU-2022:2830-1 |
| SLE HPC 15 | gnutls | 3.6.7-150000.6.45.2 | SUSE-SU-2022:2830-1 |
| SUSE Enterprise Storage 6 | gnutls | 3.6.7-150000.6.45.2 | SUSE-SU-2022:2830-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | gnutls | 3.6.7-14.16.1 | openSUSE-SU-2022:0717-1 |
Advisories 11
- 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
- USN-5750-1 gnutls28 vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-5550-1 gnutls28 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-3070-1 gnutls28 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2022:0678-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0717-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2022:0717-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:0677-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:2830-1 Security update for gnutls SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- WID-SEC-2022-0920 GnuTLS: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Nov 29, 2022
References
- https://gitlab.com/gnutls/gnutls/-/issues/1306
- https://bugzilla.redhat.com/show_bug.cgi?id=2044156
- https://access.redhat.com/security/cve/CVE-2021-4209
- https://gitlab.com/gnutls/gnutls/-/merge_requests/1503
- https://gitlab.com/gnutls/gnutls/-/commit/3db352734472d851318944db13be73da61300568
- https://security.netapp.com/advisory/ntap-20220915-0005/