Description
The LockServer function in os/utils.c in X.Org xserver before 1.11.2 allows local users to determine the existence of arbitrary files via a symlink attack on a temporary lock file, which is handled differently if the file exists.
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 | xorg-server | 2:1.11.1.901-2 | — |
| Debian 13 | xorg-server | 2:1.11.1.901-2 | — |
| Debian 12 | xorg-server | 2:1.11.1.901-2 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | xorg-x11-server +8 | 1.10.6-1.el6 | RHSA-2012:0939 |
| RHEL 5 | xorg-x11-server +7 | 1.1.1-48.90.el5 | RHSA-2012:0303 |
Advisories 2
- RHSA-2012:0939 Red Hat Security Advisory: xorg-x11-server security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2012:0303 Red Hat Security Advisory: xorg-x11-server security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- http://cgit.freedesktop.org/xorg/xserver/commit/?id=6ba44b91e37622ef8c146d8f2ac92d708a18ed34
- [xorg] 20111018 X.Org security advisory: xserver locking code issues mailing-list
- 46460 third-party-advisory
- RHSA-2012:0939 vendor-advisory
- 49579 third-party-advisory