Description
Vixie Cron before the 3.0pl1-133 Debian package allows local users to cause a denial of service (use-after-free and daemon crash) because of a force_rescan_user error.
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 | cron | 3.0pl1-133 | — |
| Debian 13 | cron | 3.0pl1-133 | — |
| Debian 12 | cron | 3.0pl1-133 | — |
| Debian 9 | cron | 3.0pl1-128+deb9u2 | DLA-2801-1 |
| Debian 8 | cron | 3.0pl1-127+deb8u2 | DLA-1723-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | cron | 3.0pl1-128.1ubuntu1.1 | USN-5259-2 |
| Ubuntu 14.04 LTS | cron | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | cron | 3.0pl1-128ubuntu2+esm1 | USN-5259-1 |
Advisories 4
- USN-5259-1 cron vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-5259-2 cron vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-2801-1 cron - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1723-1 cron - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://salsa.debian.org/debian/cron/commit/40791b93
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=809167
- https://packages.qa.debian.org/c/cron/news/20190311T170403Z.html
- [debian-lts-announce] 20190321 [SECURITY] [DLA 1723-1] cron security update mailing-list
- [debian-lts-announce] 20211030 [SECURITY] [DLA 2801-1] cron security update mailing-list