Description
Buffer overflow in NTPsec's Zyfer refclock allows local attacker to crash ntpd
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| NTPsec | ntpsec | < 1.2.5 | 1.2.5 |
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 | ntpsec | 1.2.5+dfsg-1 | — |
| Debian 13 | ntpsec | No fix yet | — |
| Debian 12 | ntpsec | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ntpsec | No fix yet | — |
| Ubuntu 26.04 LTS | ntpsec | No fix yet | — |
| Ubuntu 24.04 LTS | ntpsec | No fix yet | — |
| Ubuntu 22.04 LTS | ntpsec | No fix yet | — |
| Ubuntu 20.04 LTS | ntpsec | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | ntpsec | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ntpsec | 1.2.5-1.1 | openSUSE-SU-2026:11417-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | ntpsec | 1.2.5-r0 | — |
Advisories 1
- openSUSE-SU-2026:11417-1 libntpc1-1.2.5-1.1 on GA media SUSE / openSUSE Security Updates · Aug 2, 2026