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CVE-2011-4028· NVD / CVE Program· CNA mitre

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

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.

LowCVSS 1.2 · v2.0—No exploit Fix available
Published
Jul 3, 2012
Updated
Jun 16, 2026
EPSS
0.4% · 29th percentile
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Report tools

JSON

Action score

4

Monitor

Low priority for now.

CVSS
4 / 40 · 1.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

Affected systems

VendorProduct
x.orgx server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • x.org x serverup to 1.11.1 inclusive
  • x.org x server1.11.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12xorg-serverbefore 2:1.11.1.901-22:1.11.1.901-2
Red Hat:enterprise_linux:5::clientxorg-x11-server-Xdmxbefore 0:1.1.1-48.90.el50:1.1.1-48.90.el5
Red Hat:enterprise_linux:5::clientxorg-x11-server-Xephyrbefore 0:1.1.1-48.90.el50:1.1.1-48.90.el5
Red Hat:enterprise_linux:5::clientxorg-x11-server-Xnestbefore 0:1.1.1-48.90.el50:1.1.1-48.90.el5
Red Hat:enterprise_linux:5::clientxorg-x11-server-Xorgbefore 0:1.1.1-48.90.el50:1.1.1-48.90.el5
Red Hat:enterprise_linux:5::clientxorg-x11-server-Xvfbbefore 0:1.1.1-48.90.el50:1.1.1-48.90.el5
Red Hat:enterprise_linux:5::clientxorg-x11-server-Xvnc-sourcebefore 0:1.1.1-48.90.el50:1.1.1-48.90.el5
Red Hat:enterprise_linux:5::client_workstationxorg-x11-serverbefore 0:1.1.1-48.90.el50:1.1.1-48.90.el5
Red Hat:enterprise_linux:5::client_workstationxorg-x11-server-debuginfobefore 0:1.1.1-48.90.el50:1.1.1-48.90.el5
Red Hat:enterprise_linux:5::client_workstationxorg-x11-server-sdkbefore 0:1.1.1-48.90.el50:1.1.1-48.90.el5
Red Hat:enterprise_linux:6::clientxorg-x11-serverbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-commonbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-debuginfobefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-develbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-sourcebefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xdmxbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xephyrbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xnestbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xorgbefore 0:1.10.6-1.el60:1.10.6-1.el6
Red Hat:enterprise_linux:6::clientxorg-x11-server-Xvfbbefore 0:1.10.6-1.el60:1.10.6-1.el6

Same product

x.org: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-6816Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer
    40Plan
  • CVE-2007-6427The XInput extension in X.Org Xserver before 1.4.1 allows context-dependent attackers to execute arbitrary code via requests related to byte
    38Monitor
  • CVE-2026-56000xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()
    36Monitor
  • CVE-2026-34002Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling
    36Monitor
  • CVE-2026-34000Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.
    36Monitor
  • CVE-2022-46344A vulnerability was found in X.Org.
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:xorg-server2:1.11.1.901-2 · Debian:12Package registry (OSV)
red hat:xorg-x11-server0:1.1.1-48.90.el5 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:xorg-x11-server-common0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-debuginfo0:1.1.1-48.90.el5 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:xorg-x11-server-devel0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-sdk0:1.1.1-48.90.el5 · Red Hat:enterprise_linux:5::client_workstationPackage registry (OSV)
red hat:xorg-x11-server-source0:1.10.6-1.el6 · Red Hat:enterprise_linux:6::clientPackage registry (OSV)
red hat:xorg-x11-server-Xdmx0:1.1.1-48.90.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:xorg-x11-server-Xephyr0:1.1.1-48.90.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:xorg-x11-server-Xnest0:1.1.1-48.90.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:xorg-x11-server-Xorg0:1.1.1-48.90.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:xorg-x11-server-Xvfb0:1.1.1-48.90.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:xorg-x11-server-Xvnc-source0:1.1.1-48.90.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
P · data can be read
Integrity
none
Availability
none
Attack complexity
High
Confidentiality impact
P
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-59 · Improper Link Resolution Before File Access ('Link Following')

CVSS vector

AV:L/AC:H/Au:N/C:P/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records