Description
The mpi_powm function in Libgcrypt before 1.6.3 and GnuPG before 1.4.19 allows attackers to obtain sensitive information by leveraging timing differences when accessing a pre-computed table during modular exponentiation, related to a "Last-Level Cache Side-Channel Attack."
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GNU | Libgcrypt | before 1.6.3 | — |
| GNU | GnuPG | before 1.4.19 | — |
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 | libgcrypt20 | 1.6.3-2 | — |
| Debian 13 | libgcrypt20 | 1.6.3-2 | — |
| Debian 12 | libgcrypt20 | 1.6.3-2 | — |
| Debian 7 | gnupg | 1.4.12-7+deb7u7 | DSA-3184-1 |
| Debian 7 | libgcrypt11 | 1.5.0-5+deb7u3 | DSA-3185-1 |
| Debian 6.0 | gnupg | 1.4.10-4+squeeze7 | DLA-175-1 |
| Debian 6.0 | libgcrypt11 | 1.4.5-2+squeeze3 | DLA-190-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | gnupg | 1.4.16-1ubuntu2.3 | USN-2554-1 |
| Ubuntu 14.04 LTS | gnupg2 | 2.0.22-3ubuntu1.3 | USN-2554-1 |
| Ubuntu 14.04 LTS | libgcrypt11 | 1.5.3-2ubuntu4.2 | USN-2555-1 |
| Ubuntu 14.04 LTS | libgcrypt20 | 1.6.1-2ubuntu1.14.04.1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | libgcrypt | 1.6.1-16.1 | SUSE-SU-2015:1511-1 |
| SLES 11 SP4 | libgcrypt | 1.5.0-0.19.1 | SUSE-SU-2015:1626-1 |
| SLES 11 SP3 | libgcrypt | 1.5.0-0.19.1 | SUSE-SU-2015:1626-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | libgcrypt | 1.6.1-16.1 | SUSE-SU-2015:1511-1 |
| SLES for SAP 11 SP4 | libgcrypt | 1.5.0-0.19.1 | SUSE-SU-2015:1626-1 |
| SLES for SAP 11 SP3 | libgcrypt | 1.5.0-0.19.1 | SUSE-SU-2015:1626-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libgcrypt | 1.7.3-1.3 | openSUSE-SU-2024:10037-1 |
Advisories 9
- USN-2555-1 libgcrypt11, libgcrypt20 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3185-1 libgcrypt11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3184-1 gnupg - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-190-1 libgcrypt11 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-175-1 gnupg - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2554-1 gnupg, gnupg2 vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2015:1511-1 Security update for libgcrypt SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10037-1 libgcrypt-cavs-1.7.3-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2015:1626-1 Security update for libgcrypt SUSE / openSUSE Security Updates · May 2, 2025